Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18bb65b2d17910d…

MALICIOUS

PDF

93.3 KB Created: 2021-01-06 06:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9f01f0da3d11c58b73381c3a685eb3bf SHA-1: a8ddbef197f0cfa31ab197adcd83647aca1e6216 SHA-256: a18bb65b2d17910d20229cd4ba8913f0d0bc23be755837f5a2efeeb536aa2451
252 Risk Score

Malware Insights

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

This PDF file contains numerous links to external PDF documents, many of which are hosted on disposable domains or redirect to malicious infrastructure. The document body, though heavily obfuscated, contains text related to vehicle accident history reports, suggesting a lure to trick users into clicking these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://ggtraff.ru/aws?utm_term=vehicle+accident+history+report+free In PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/3437050.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/jijh6ib/74576285988.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/jozomoxowop-jozapotukasofan-xiraturabanuzum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fdba9445d0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_5fa633442062c.pdfIn PDF document text
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/pofewejixixog-ridowivabu-guzuga-xojatu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365567/normal_5fec679ecfa5a.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/hiScigR/degonizoxutifiwidawoxavem.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/3597234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f873c707b01b.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/dunexobuxuze_dirir_zifadi_gutafobidap.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/dobikasukavu/kemerufo.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 5312 bytes
SHA-256: def476f2eba486d295d3525880f6c304fff6aec0579f9ea0765ca02546ffa3a1
font_01_sfnt_off00013411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13411 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00013f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F75 11980 bytes
SHA-256: 9272faee5cc0d3611ecd806369e354127db80f87cb652560968320fb99015c72

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