Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e3a3186c256a85…

MALICIOUS

PDF

106.5 KB Created: 2021-03-25 12:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b625d995d6428980166314418e107611 SHA-1: 0114cacacaeb8b1f7b910d8a6fc4cc87e3ecf507 SHA-256: 71e3a3186c256a859a4d9a5fa425acf222c97c2b697a7bbe51b03d2eb68c0efb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://resalured.ru/award?keyword=sdgs+pdf+indonesia PDF link annotation
    • https://ralutadepijug.weebly.com/uploads/1/3/5/3/135305627/lusotip-nudam-votunivomawowup.pdfIn PDF document text
    • https://taborufizuxedo.weebly.com/uploads/1/3/5/4/135400835/7d8aa19a8a9.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/Iidm1ok/dead_man_walking_book_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/03hjghP/barber_shop_ellensburg.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/ia2ijoD/petadotukiporofofudesik.pdfIn PDF document text
    • https://ginupegoforijef.weebly.com/uploads/1/3/4/7/134760486/jasidixavoxezip.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/hiheGie/cake_recipe_gluten_free_vegan.pdfIn PDF document text
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/7794cb875258d58.pdfIn PDF document text
    • https://tigamapelexoka.weebly.com/uploads/1/3/4/6/134633170/vadudiwuzo-kofamozezebexe-zezudele.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/50fc8db8da.pdfIn PDF document text
    • https://gemiporelowagi.weebly.com/uploads/1/3/0/7/130775846/gepil.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/gEJgiF4/mirrorless_camera_for_beginners_philippines.pdfIn PDF document text
    • https://narusipanunajix.weebly.com/uploads/1/3/1/0/131069819/peraxojesabilevakani.pdfIn PDF document text
    • https://fezivalolir.weebly.com/uploads/1/3/4/4/134461714/2872217.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/Itiihij/bikonasivumipur.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/17a43856-0aea-458c-8c06-baab4643d229/blackdecker_easy_assembly_8-cup_food_processor_fp4200b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dffb5d1-940f-4d17-b22d-181ede010388/ryobi_miter_saw_7_1_4_home_depot.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_86d83030a3574dfd83968352d7e1c925.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_2e326f056c5b460abdd0516ac2c2bd6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e51be8-e134-4a91-b773-0a65389e845b/vegofap.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001505c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1505C 6496 bytes
SHA-256: 472b61745d5f85d81c7f2670c5cfe89848d4262aa98c9982153fa86962e9ff29
font_00_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 5184 bytes
SHA-256: 8251c3f3ab5e4dbfb1c019ec1d4b09036cf831f44820b38ad0baa60a466b0640
font_01_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16640 bytes
SHA-256: f7cd475099dc92d38465b2bd06498421e63ecc221ba8f236aa58a6518c020321
font_03_sfnt_off000163eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EB 11404 bytes
SHA-256: d65f2000b972c55710d65a70ffa9214b8a17bb2be7ec4858720f60e4804d89d3
font_04_sfnt_off00018a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A4D 4692 bytes
SHA-256: 9f557d519596580adb7135ae519ac102b6fc1a1611bd93cd316943939d071f22

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