Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5b7291a37b33de…

MALICIOUS

PDF

133.0 KB Created: 2021-04-08 19:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e9589732f9ca38572566aa484096c3d6 SHA-1: 4e11028c16b17beb7e9af7527a0121742eeb07af SHA-256: 7e5b7291a37b33de72f395c9c0274753e9494140d5391266c88a79bd84f6abc1
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, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm behavior point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=craftsman+kohler+courage+xt-6+lawn+mower+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464861/normal_5fd98f70deff9.pdfIn PDF document text
    • http://bogavevi.22web.org/google_sheet_application_scope_uipath.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427077/normal_5fe38152b2822.pdfIn PDF document text
    • http://nilutafejo.mypressonline.com/wosotubo.pdfIn PDF document text
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/3a373.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/bdaf89.pdfIn PDF document text
    • http://ratonawe.iblogger.org/email_format_for_leave_request_to_boss.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_6037d3e59fe0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xaramoturowuf.rf.gd/77964865154.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/anemia_sideroblastica_fisiopatologia.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_df9569f7e48d4879a19416219151287e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e304b93a-d9f0-46ad-a1c2-18997ab25d99/rewepopotawamelupo.pdfIn PDF document text
    • http://nimozan.epizy.com/96532496612.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_73589ef2c84d4299b0874d518dac789a.pdf?index=trueIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_f84971408a0c4ef88d88f276316c60cf.pdf?index=trueIn PDF document text
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_efeb5337f9f047628bb85f73f55a6351.pdf?index=trueIn PDF document text
    • http://xufolat.atwebpages.com/witipofegizofegusewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca43fa0c-2bae-4933-bbd6-bd7a89a43a49/circe_madeline_miller_age_rating.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C09E 5696 bytes
SHA-256: 832d3d98ed9d12070070bce5a413e931d6bf26605e556f62e6268926e0e4ce2d
font_01_sfnt_off0001d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D401 10632 bytes
SHA-256: 2f1888dadd38bbbf53d7e5f9104db1ade8807fb00f0718127c436345e2f2121e
font_02_sfnt_off0001f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F809 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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