Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6be5186b4e71e4…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 14:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 61849d9e51dd1ed89c39a46ee7bd19d4 SHA-1: 75e089d8f7ea53d4fd608ba935aeda24b5462dde SHA-256: ba6be5186b4e71e4d688113946a341e2fcb986141d958a1bfecc0782731d6beb
212 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a phishing and advance-fee scam lure, including urgency and parcel delivery language. It also features a large number of external links, many pointing to PDFs hosted on cloud storage or other domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/strik?utm_term=brother+hl-l2380dw+toner+officeworks PDF link annotation
    • https://cdn.sqhk.co/suwuwewazaka/ifrjfib/vogavoxozegotunibise.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fe22660c4cc2.pdfIn PDF document text
    • http://pubguckazan.com/93755992741xtivo.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/iijcgjQ/denuxoregunasig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdddafbc207c.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/gcjf6je/limawut.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/haC0LRW/race_car_coloring_book_print.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5ff53a9f621bf.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/f361b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wezukep/94436611597.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/tezazivibekiwezozukavo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 5768 bytes
SHA-256: 7cd275eb2f19a780510c8dd10351e5d053995014de06f38606594be3e72b3f4b
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 10972 bytes
SHA-256: 4976bb62fd0ba947cd09aca4dfe3d72f6abfa521a6fd8a7bf629710fc02d2029

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