Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8b1e1b58eb7313…

MALICIOUS

PDF

76.1 KB Created: 2021-01-27 14:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ed69876f2c924af3967321def7bf960 SHA-1: 487a12915aa29488ba5c430fc24900eef8280ef0 SHA-256: cf8b1e1b58eb7313587a0c5bbe3d34a5dff06d2f20796c2e727d4350d16d2adb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is indicative of a link farm or SEO spamming operation. ClamAV and ML heuristics also flagged the file as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://traffset.ru/wb?keyword=3%20red%20and%20blue%20game PDF link annotation
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/jekokasenen_redorebupoba.pdfIn PDF document text
    • https://varijamali.weebly.com/uploads/1/3/1/8/131856150/fe4f4b.pdfIn PDF document text
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/1692545.pdfIn PDF document text
    • http://zespodsvetkoy.site/38040191321f3jlh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fd7edff2ec86.pdfIn PDF document text
    • http://harmony-market.ru/su_dalgalar_fizikm8i3k.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/zn9ieia/vomasonesesufolavax.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/chgjf4y/wojelamubekexinazoz.pdfIn PDF document text
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/zelakekizabebafi.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hjf9ZIj/zombie_hq_download_play_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462350/normal_5fcf89793fbae.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/iaAzhbu/hockey_jersey_display_case.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/iagdchf/hyper_cars_prices.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/QgcdDCu/14446600131.pdfIn PDF document text
    • http://guitar.su/gurajex1lfq6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_60096a3045d52.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/5091ef.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/7129582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_600de086be914.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 5176 bytes
SHA-256: 641b4342d08476458a19b98d8c757066abc61a3c81b016aafcaf387b245d231e
font_01_sfnt_off0000ffa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 10724 bytes
SHA-256: fbeac89b16537ca95758ae4642da7b2c8025edd9f34f04046020025eaf55a519

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