Malicious PDF — malware analysis report

Static analysis result for SHA-256 389426bdbb663f5e…

MALICIOUS

PDF

75.1 KB Created: 2021-01-03 12:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f4f1c78c9469ef557a65a722d9929428 SHA-1: e08c12f64d1ceb7f3f7df718cea269e7ab90f134 SHA-256: 389426bdbb663f5ef88160e855e6e68ff3ea9e6233941ab0d4fe7d593d20dea2
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users. The presence of a 'uscis form i-912' lure in the document body, combined with the heuristic firings for PDF SEO link farms and ClamAV detection as a phishing trojan, indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/aws?utm_term=uscis+form+i-+912 PDF link annotation
    • https://cdn.sqhk.co/wirowanorax/gj4u2hd/64718247925.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/zatiruvag.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_5fada6eda52fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fc40806323f4.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/supiwatoxanesurev.pdfIn PDF document text
    • https://luvagifewu.weebly.com/uploads/1/3/4/7/134766249/c421e3cf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8cb348510c8.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/dekuperot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f893f2fcbd23.pdfIn PDF document text
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/1956229.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/Khi2Wua/world_soccer_league_all_teams_unlocked_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dixaleko/emf_2018_darmstadt.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/28883563479.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 4632 bytes
SHA-256: 9386b902aa77179b17011df4c3a9d738dc9a519f49aaa55ae4ec43bc48ac6c41
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 11008 bytes
SHA-256: 96b1a76e6fb68e4058995b321eec7d03381dc69dcd70e879af62cc60beb19b91
font_02_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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