Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f9a7f2a356ff3…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 16:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 277aaf0b402e3d74ee10ae973d3d5288 SHA-1: e3d669efbe19eb1eacfa5b31396cbc5368c77abf SHA-256: 4f3f9a7f2a356ff3dbbc628efe019c3bdd65326cc183de97916081f34750139d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=cid+watch+online+desirulez PDF link annotation
    • https://rakurewirusemew.weebly.com/uploads/1/3/4/0/134017151/2842261.pdfIn PDF document text
    • https://bumifinanefisan.weebly.com/uploads/1/3/2/8/132814282/zinekeduf_degozun_jokajomedumowow_fodanali.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368735/normal_5ff130974634c.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/topazavupavup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_5fd6492feb7f6.pdfIn PDF document text
    • https://duzofonateras.weebly.com/uploads/1/3/4/4/134494902/9127518.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/burubo-sovisi-segav.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/dufikasikezegagekelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_601aabad0e632.pdfIn PDF document text
    • https://zuxufigosod.weebly.com/uploads/1/3/4/3/134309968/perixabitak.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/e4fc4d99d5eb4.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://forubav.rf.gd/58752697874.pdfIn PDF document text
    • http://mabofikoparu.epizy.com/31287351901.pdfIn PDF document text
    • http://sobenikirija.rf.gd/tafew.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/police_report_number_wa.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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 5076 bytes
SHA-256: 0600dc4247b6a65cbd7fc8bc5fbc357e16b2a8778ee90853c5359b6134ff33db
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 10384 bytes
SHA-256: 4605629d5551cc430e03c60e29f8f60c0a26a4417d5b5203dd0b8099a84fc738
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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