Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bff6891f52d58b…

MALICIOUS

PDF

76.6 KB Created: 2021-01-20 06:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 23e3e0b602e5f87ab22d8913ab1a350d SHA-1: d988550934797a972c7bc853f37355ed384f5088 SHA-256: 83bff6891f52d58baeb304eed787a5347d9254dad4e8e3b08bfbf82dbadd2bbb
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs pointing to disposable hosting, likely to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=tintin+in+tibet+pdf+blackkat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5feb71b3d14cf.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/navukosi-vifebilizutegub-gifuvum-metejadunuma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5febaa7828e3f.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/nikokoxo.pdfIn PDF document text
    • https://jivupofa.weebly.com/uploads/1/3/1/4/131406879/3298626.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/patesonidu.pdfIn PDF document text
    • https://vaxokivov.weebly.com/uploads/1/3/1/4/131453734/vojitefajifujaxidur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5fda236987765.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/3150600.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/hicVvij/kexajopuximuzujine.pdfIn PDF document text
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/1114bd7429f.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/ridefizison_dewizuviwa.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/fgeQjdu/server_list_for_minecraft_pe.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/cosmic_showdown_hack_download.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/2759611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401972/normal_5ff40d2c37d32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485927/normal_6000b4a6ad463.pdfIn PDF document text
    • https://site-1172205.mozfiles.com/files/1172205/cash_app_quick_money_earn_money_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/nPGfih1/feral_cat_population_by_state.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f8b30986826c.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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 5028 bytes
SHA-256: 24f9d95497c22d04f2380ea02ae305821164151403c3975ee0e9fc7549ce3a9e
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 10584 bytes
SHA-256: 52872b64151d23046b6ab5e179408365a36eb33020834b93d29fefbc4a86c760

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