Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d1764547dc53b9…

MALICIOUS

PDF

121.3 KB Created: 2020-11-06 17:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 299d4b6109743c5d4eaeb464e4b74406 SHA-1: e94495fc8ec4159562f61b641410c00340c318b9 SHA-256: 71d1764547dc53b9e7625c31f443041b52e84ea1072f143140dc67dedcd9e487
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by an ML classifier and contains a large number of external links, many pointing to disposable domains. The primary purpose appears to be SEO manipulation or acting as a gateway to other potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a mechanism for redirecting users to external resources, which could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?keyword=softball+diamond+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5f8dfed72075f.pdfIn PDF document text
    • https://mebogizudoredo.weebly.com/uploads/1/3/4/4/134472702/fenozadax.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/7469716.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3079835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f9b87e514898.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/vidofobujepibuguzi.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/3823856.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/0fc3cfaf-ce09-4966-bb08-debfc3e010e7/weave_silk_tiger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ffeeda-4d42-474b-a854-21cbe38dbb0e/bizubezure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7891912-e104-4997-bee3-db400c4e4b64/mojebaxekosexogerigukave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e480f7-c181-4f70-8c76-b31f78a3363e/activity_series_chemistry_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c87be387-c4b0-4138-871c-5a9967e10bb7/muazzez_ilmiye__epub.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/vibinofa.pdfIn PDF document text
    • https://lufefot.files.wordpress.com/2020/11/marriage_d_amour_piano_sheet_music.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001726a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1726A 3684 bytes
SHA-256: aaae579d731174b76546da80294d4cb491f9d3d801c25ea73233c7d4ca5b282f
font_01_sfnt_off00017f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F70 5156 bytes
SHA-256: 583d923c7cc3a30792e21209bddab2adde045e2e7f00f087a853287ede9dfff3
font_02_sfnt_off000190e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E8 14904 bytes
SHA-256: 68e8ec08b348ca3bf69f60bda36cf34874d6e7154ca9ab9d5959138f18f4dbc0
font_03_sfnt_off0001c09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C09A 16456 bytes
SHA-256: fc32946558f660c05179103920752d4606e25e1fef7aea7db9d61d75f8d81a25

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