Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff3a0707df2bed…

MALICIOUS

PDF

64.7 KB Created: 2020-12-21 17:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e7ce6f981ad618aec7115a9a84631df0 SHA-1: 7d16131166fdb5ce756d2e581b7d89784fea7821 SHA-256: a8ff3a0707df2bed1f607e1b4412a0ac6a514c33a55c7f4e2d21938719373f83
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a large number of external links, specifically a 'link farm' heuristic, suggests an attempt to manipulate search engine results or redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=why+do+we+need+computers+in+our+life PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420222/normal_5f982d8bbdbaf.pdfIn PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/5451498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_5fd385c8f30fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f87d56d6ffb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_5fa1f1fa5b96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_5fa97ad3073b3.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/jewaxutubikav.pdfIn PDF document text
    • https://moduruwili.weebly.com/uploads/1/3/2/7/132710657/5534519.pdfIn PDF document text
    • https://puliwive.weebly.com/uploads/1/3/4/6/134660228/zajiru_zuwuparu_xizufupuga_poneduladotibe.pdfIn PDF document text
    • https://kilekawu.weebly.com/uploads/1/3/4/8/134857711/6865929.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/henghuili-files2/67720069215.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/origami_bouquet_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/70128954279.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_off0000bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB0 5392 bytes
SHA-256: 6b607a6054167db3f5bc00e62956db8b35d523ef4fefeef6223ddf670961b165
font_01_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 10548 bytes
SHA-256: ed0c345f9ed5d6db69d4c979e2a9786e9facc8f66811d19df1d862fc290fd73b

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