Malicious PDF — malware analysis report

Static analysis result for SHA-256 3839046f7d8f3990…

MALICIOUS

PDF

80.2 KB Created: 2021-06-14 18:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9adf11cea20ccd5d8bd5b740ba9e0cad SHA-1: 1fb0f3481b4f6dce9b509ba6bca55c307fcffa83 SHA-256: 3839046f7d8f399095cda1fa05e34e85f562238c6a79051ee67092921a7d91d9
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/pbw?utm_term=download+ti+ft+young+thug+about+the+money+mp3 PDF link annotation
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/nenave.pdfIn PDF document text
    • https://jezemukefanufem.weebly.com/uploads/1/3/4/7/134765918/woresuz.pdfIn PDF document text
    • https://venepefo.weebly.com/uploads/1/3/4/6/134666716/nixon.pdfIn PDF document text
    • https://xavebebojemap.weebly.com/uploads/1/3/4/8/134848852/1607506.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/375bb89faac4.pdfIn PDF document text
    • https://teveluzisobe.weebly.com/uploads/1/3/5/2/135299025/niworuwizeliru.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/f0be9.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/bagad-dekojonudowilo.pdfIn PDF document text
    • https://vesokawewewavi.weebly.com/uploads/1/3/1/3/131382886/d0f2ad.pdfIn PDF document text
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/tilarefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/556d62c4-07d0-4748-8e99-068a686c7f8f/horton_hears_a_who_yellow_thing_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59844915-3e9c-40d3-8d22-dc0685e86d15/38015727797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27360cc8-6c6f-4c37-816e-1899c1659a46/23893460751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5073c6-948b-4dac-bc35-7edc439a0176/12770386722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c1ac25-c468-4997-abb9-288e6c755fb1/six_best_books_to_read_for_a_successful_career.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955d9367-264d-47b8-805b-c4dfcaae440e/vafutekejolasemolizuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ea6a95-8ffc-4d0a-a03d-d6b950ecb20e/40964072389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bddd4f82-9d87-4850-b1ae-a98f45e08032/market_leader_upper_intermediate_3rd_edition_answer_key_unit_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb25c76-2b7b-4c89-88b0-7d889a42dc41/98422242786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f11b88-8f8a-4f4e-8698-eed9705d8c99/how_to_install_bluestacks_on_chromebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc7bb14-f565-4d87-85dc-eb540a7623fa/fabelaleger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc52960-51fb-4c6b-bc65-e4bf24b00c58/duparurifafunosulanug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc7f755-03e5-43c9-9d24-a088964cfe09/demosewotabiliximu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac99d09-35d7-4bb9-9fb1-29a869606851/91956741446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c01cb45-ea17-4e1a-b48b-0523a68e2f91/27509684067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9726d14-d1fe-410b-8c4e-f68d6070e7ed/mikexejis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5680 bytes
SHA-256: 9ec574503930ab90a7a67b80a960d9d594bb78365f9b22b2459b85abeec5a1f3
font_01_sfnt_off0000f4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F0 11772 bytes
SHA-256: 2ab77e6b665b17b7a525efd243f6105be52865f82213507e5e2ab7ee07b7ec95
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16172 bytes
SHA-256: 86e677f440293af71634f76af97d77f1579c42b35ddb5b40cffc115ca4a5f7a9