Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c0b0941d5363d…

MALICIOUS

PDF

89.6 KB Created: 2021-05-10 19:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8b170950414ae75f3ccef2bcde24ce77 SHA-1: 5f4e2899c648383d073313bdb9bba8c2814eda83 SHA-256: ef7c0b0941d5363d5224e3186b6b53dd51a07b67ef915b2544bf99a59cd0afef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=the+chronicles+of+narnia+full+movie+online+watch PDF link annotation
    • https://jibeguviju.weebly.com/uploads/1/3/4/7/134723477/newiwaxagavanul.pdfIn PDF document text
    • http://idealslimitaly-official.site/finding_asymptotes_of_rational_functionss0csy.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/gupameromadadi-gumov.pdfIn PDF document text
    • http://lazerepil.site/20166012102g6055.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/fosiniwaxox.pdfIn PDF document text
    • http://pressit.space/zisofosoburotilb795v.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/3190637.pdfIn PDF document text
    • http://italy50wow.pro/wuvimajutrsmtx.pdfIn PDF document text
    • http://fc-aromat.ru/soul_plane_movie_freeggix7.pdfIn PDF document text
    • http://cafe-cok.ru/45489797856pfzyb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413590/normal_5ff8d7b92270f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6023dc720269a.pdfIn PDF document text
    • https://nuzewive.weebly.com/uploads/1/3/1/1/131164046/3387965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatapusaf.rf.gd/valvular_afib_guidelines.pdfIn PDF document text
    • http://wowifimeziv.rf.gd/ligitipixoredizi.pdfIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_8bb487d06cbd4c6b9b5f39f7e21cc230.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_3b5a73899a834eeea31d43470d96d7fe.pdf?index=trueIn 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_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 5224 bytes
SHA-256: 8302802d4488763135e6487851e5c4e7f0b09047d80946dc9116ac8ea408a6a3
font_01_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 11012 bytes
SHA-256: 5772e1b3ce4f4abfc143bc4e8c64aebce02ce5313e017b3929559a6e1d104dfa

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