Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2dd1edefd9997f…

MALICIOUS

PDF

83.5 KB Created: 2021-02-22 22:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 687749236a6ef306b7b8c6b959f8fb35 SHA-1: 15b6fbc36e59cd294462868d5e9b5fc1acaae6db SHA-256: fb2dd1edefd9997f8be79ef5688e8825eaec988257f36e2e1d17d59d397ca41d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classification and ClamAV. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO manipulation scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be intended to trick users into downloading a password-protected archive, a common tactic to bypass security scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seumenha.ru/strik?utm_term=biblia+reina+valera+en+audio+descargar+gratis+para+usb PDF link annotation
    • https://cdn.sqhk.co/dejijadu/Rhl6Sgg/hello_neighbor_act_2_walkthrough_xbox_one.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/890235.pdfIn PDF document text
    • https://nuzoligul.weebly.com/uploads/1/3/3/9/133997434/9ef18e.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/gjigg7i/kick_the_buddy_mod_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382976/normal_5ffbd7f810f3d.pdfIn PDF document text
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/pamulenilupilujefa.pdfIn PDF document text
    • http://kluruu.info/zhu_scalp_acupuncture_bookni5x8.pdfIn PDF document text
    • https://mozakemu.weebly.com/uploads/1/3/0/7/130738716/eacd62bd.pdfIn PDF document text
    • http://vpntop.info/retirement_pension_formq2ae2.pdfIn PDF document text
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/butowikumo.pdfIn PDF document text
    • http://fenellalucynelle.info/biodata_format_for_job_interviewobf5m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_600f2c68c4277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389394/normal_5ffc978534c2a.pdfIn PDF document text
    • http://insurancesouk.com/cold_equations_summarynd1jj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fc6f4b62a113.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/nedodigutudozexire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6022e98c9bcbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 5492 bytes
SHA-256: af393a60ef8e99b3b2c3dd2cf04b01fbdc9171b0715c6973f3bc702c35a0326f
font_01_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 3120 bytes
SHA-256: fde507d3e12ec33e68adf7e75fc7402ffd28b0db1492fb6dd1e3c49ab7b9519b
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 12636 bytes
SHA-256: c52e442e9148dc303d5d23b3611c1a6ad233caa838db7c54ab8e7d98265a64be

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