Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92451d1aa855c1a…

MALICIOUS

PDF

75.3 KB Created: 2021-03-02 22:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3f691a7de9302c1188b61b9f0072c469 SHA-1: ef9b4aa051724639adbac06b2ae755768cbb9a60 SHA-256: c92451d1aa855c1a07711f5b5319146106e0de063578b3ac3b10147333c8b559
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or SEO link farm. It contains numerous external links, many pointing to disposable domains or Weebly subdomains, suggesting an attempt to redirect users to malicious or spam content. The presence of external URIs and the link farm heuristic indicate a pattern of directing users away from the document to potentially harmful sites.

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://maypoin.ru/award?keyword=difference+between+object+oriented+programming+and+functional+programming+in+java PDF link annotation
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/fodowexikuto_jilugixaru_rokirimo.pdfIn PDF document text
    • https://sojurepew.weebly.com/uploads/1/3/5/9/135992925/4b5cd44c6ac.pdfIn PDF document text
    • https://wenajatimox.weebly.com/uploads/1/3/4/4/134480159/4733719.pdfIn PDF document text
    • http://ro-shop.space/what_causes_aggressive_behavior_in_dogsf1qw7.pdfIn PDF document text
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/mogilut.pdfIn PDF document text
    • http://yachts-4-sale.com/5897108797003m.pdfIn PDF document text
    • https://nakowubolitek.weebly.com/uploads/1/3/5/3/135349387/0b5f31f3.pdfIn PDF document text
    • https://mutixuvuv.weebly.com/uploads/1/3/4/6/134665255/3347123.pdfIn PDF document text
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/b5df8c83b3fe33.pdfIn PDF document text
    • http://habercigo.com/26818970977hmryo.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/putujobokoxabejabu.pdfIn PDF document text
    • http://crawlmqyu.space/27473724298100cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mogedozara/xupob.pdfIn PDF document text
    • http://mobopufo.rf.gd/19100185004.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/business_proposal_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/2007_buell_firebolt_xb12r_owners_manual.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5664 bytes
SHA-256: 26d850716be9db4597133f4330cad10423cdde7111be16c4ce9736a153595a04
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10116 bytes
SHA-256: e33c8c2be88c2cdc4b60cf85341bab4efeaffcae267ff016f52ad770eaca0fa0

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