Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa89461e6521c7a0…

MALICIOUS

PDF

68.8 KB Created: 2021-01-08 15:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 96db2a14e96e755c6a367bba25a2f304 SHA-1: d28be419c66d1d7b80b8a3d02e250716b81893b9 SHA-256: aa89461e6521c7a09410bd4bfc73ca6e16239b20311d92c047bd609395654391
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest the document functions as a link farm, directing users to potentially malicious sites like 'trafffe.ru'. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or spread malicious links across disposable domains. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/aws?utm_term=epistaxis+rch+guidelines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fceba123d21a.pdfIn PDF document text
    • https://garusase.weebly.com/uploads/1/3/4/6/134634063/waraxizirun.pdfIn PDF document text
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/8641520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fe64bb8526b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fad23c9cc03b.pdfIn PDF document text
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/9085900.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2186812.pdfIn PDF document text
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/guretavubigu_fukunuwazamufir_laguvifo.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/zijifupexevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fbbccd192f1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fbc40336e9f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3110302e-6f02-4e03-b46b-d9ef6fcb09e9/raleigh_touring_bike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fa49aa-8aa8-49f1-bfc3-b6c954797fd8/nibemabarisuvalijudumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ddbe7f-6318-47c2-b219-586dd3f10ce4/zowazuwepomarijukobedama.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_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 5360 bytes
SHA-256: 7b049b114109744e3f5b3690173342956d6edff3a4df7856cdbfaea664526e24
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 10224 bytes
SHA-256: 15aac283aebaf8d4426c2839db8c9496d0d3a04133f045b8fb054cd433819b67

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