Malicious PDF — malware analysis report

Static analysis result for SHA-256 019c4cbfb15811f1…

MALICIOUS

PDF

58.7 KB Created: 2020-12-20 06:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5d6cb186a3d6f33799a0d7185b56b12a SHA-1: ad8f3b2f1fcde27a1549adc8312127a953c3d678 SHA-256: 019c4cbfb15811f1f6abfac2e2d0e65c19a89640cae940dca23660c4b0c7be9b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The embedded URL 'https://trafffe.ru/wb?keyword=blacksmith%20hammer%20wow' suggests a lure related to a game item. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://trafffe.ru/wb?keyword=blacksmith%20hammer%20wow PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414487/normal_5fd081abaac05.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/ditilamagob.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/7341701.pdfIn PDF document text
    • https://vogemafebin.weebly.com/uploads/1/3/4/2/134235603/7296546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5f9d6a308322a.pdfIn PDF document text
    • https://zunobogodosi.weebly.com/uploads/1/3/4/6/134630435/newidevefog.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/2175097.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/morodolufimijab.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/gabemomigipenaguv.pdfIn PDF document text
    • https://dozisinabi.weebly.com/uploads/1/3/4/6/134646642/rikizov.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/dfec2ad3-72fb-479f-9719-1290c9d761c3/pesasexuximan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6621068e-6540-4b97-bdde-3491da6023c4/19801085550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2bb39b-b287-49eb-8aee-d2325da38a76/modelo_do_video_gyal_you_a_party_ani.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_off0000abbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBB 5244 bytes
SHA-256: 2173999a12e72636d2f361d33034be19fb1dc2d69894ec5383594190f0e1a254
font_01_sfnt_off0000bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD76 9704 bytes
SHA-256: 48bd17aaf6b8524f6959c38e5d6791db1c72fa86130f13bc7908bad667a27cfd

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