Malicious PDF — malware analysis report

Static analysis result for SHA-256 3798d5b116ac455e…

MALICIOUS

PDF

78.7 KB Created: 2021-02-28 11:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1d90ef1ea33a87d16efff931f1c9f438 SHA-1: 5f48a5a3ae4f51026a40972bf447ce1a2e312413 SHA-256: 3798d5b116ac455e6d33aaca1d72de95afdfa6e18a398e9775b3084eddbff804
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 payload. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs and the PDF structure strongly suggest an attempt to exploit users through a phishing or content-luring mechanism, likely involving a second-stage download.

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://jacksth.ru/strik?utm_term=what+weight+wool+is+red+heart+super+saver PDF link annotation
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/7ff26685ab4566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd0d7c47e9d7.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/minove.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/xezogejididibi.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/tetogezagaxefux.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/3062467.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/6c15f698e570d0.pdfIn PDF document text
    • https://xixiduduge.weebly.com/uploads/1/3/4/7/134713202/fetaroku.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/xuvivupum_solidiro.pdfIn PDF document text
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/8203850.pdfIn PDF document text
    • http://tupakewufitid.iblogger.org/68594535948.pdfIn PDF document text
    • https://wipuzene.weebly.com/uploads/1/3/5/9/135971348/6d6d18f37.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/muzerideradofawopotivad.pdfIn PDF document text
    • https://zepagowixo.weebly.com/uploads/1/3/4/8/134887299/3090096.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/3426164.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fonobufusig.rf.gd/nimusavapuzigawaxu.pdfIn PDF document text
    • http://rususekobijo.myartsonline.com/porque_estudiar_administracion_de_empresas_yahoo.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_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 5388 bytes
SHA-256: c00717775f220c1a9173f609244d6f89d6269d1b513c55a2549ab16ef05f573b
font_02_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 11380 bytes
SHA-256: f925055f9d34b7ffdb0086d35fb7ca2e66319fcee602f98fa0abe7c473b4b3a8

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