Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e57320f1ab81b83…

MALICIOUS

PDF

78.0 KB Created: 2021-04-06 12:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eb24075cdfdf2d6a5372f44d8c656bb8 SHA-1: d2ead836a0c2040281f2d24bdcaec4636efd6d88 SHA-256: 3e57320f1ab81b831b3b0a8a64ca9d57ff06284e4e4b0500ae34ff89eb96588b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'xezojetit.ru/award?keyword=agendas+docentes+2020+pdf'. Heuristics indicate this is a link farm designed to mislead users, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=agendas+docentes+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483346/normal_6026f1531f1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_601d1b0fc10bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412588/normal_5fdd8437c7b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_604aa27bbaff3.pdfIn PDF document text
    • http://olx-delivery.cc/63823673024e0v6k.pdfIn PDF document text
    • http://onsideball.info/vekadopipeviwigogulr23w3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_6000a2d918de1.pdfIn PDF document text
    • http://medicinfo.online/xijufumenawixagaxodly6n6.pdfIn PDF document text
    • http://flowerport.store/64068846342qgcjn.pdfIn PDF document text
    • http://tryraisins.pro/baofeng_uv-5r_ebay_canadafiapr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_b959de2251ae467795abebb66aa8259e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d97ae02-9da2-462a-94f2-46953e3c7008/sawuvijezewamamuku.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_b3b75ed741ff4003a2d0e656254537aa.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_55f81dd7730c40038a2101a81e8bd740.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_d6235c62e8c74ba8abce229419f47dfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c5b8735-5084-4bd8-b209-e4b534a343ec/govofamiredef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0376081-1532-48d8-a441-1a66487759db/how_to_update_g1100_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a18c98-b978-4651-a288-6dfb2e93fca9/41943995762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accc136b-a5ed-47cf-9446-b562890b0d17/pesazasuxetunuzipexoso.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_b623a2893c8a4cffa7d2ba0c87bd75d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8225615-5f9b-41d3-b4df-66fe7a70327f/t-fal_ez_clean_deep_fryer_instruction_manual.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_257a98e4d6db4a3f83ff5afe5e79eef2.pdf?index=trueIn PDF document text
    • https://57e596f1-a2cf-4e3c-9ba9-dc8e42e7d639.filesusr.com/ugd/1e1da7_990469a4e0e248a1894a434664896d36.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 5456 bytes
SHA-256: 946dd34339013b942eebbd89d37a7adf68d24cb3887e0ee4e025e2ec648e3c55
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 12428 bytes
SHA-256: 3bb7645c2f3bb349ae1bf2caa0c84c4e292a44f20c9dfc3e2f5d35b35f77b7f3

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