Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bae513b1bb6f2e3…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 21:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: de39016b1e64dc5da931b5630f510400 SHA-1: f66badc354b95074b90d5719aa814197ae5d21c0 SHA-256: 8bae513b1bb6f2e3083dcf09d96e973c99fe160c615c1e82a1dd615a433642fc
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to manipulate search engine results for traffic diversion. The presence of external URIs suggests an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/wix?keyword=modern+marvels+heavy+metals+worksheet+answer+key PDF link annotation
    • http://maturibcgj.space/wupukexedelebirixodysbi.pdfIn PDF document text
    • http://reweder.site/tai_chi_fighting_techniquesk2k5y.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/tepanijefamo-zaxarit-xabomususebaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/a4hijgR/top_hits_2020_billboard.pdfIn PDF document text
    • http://didazema.mypressonline.com/67318759766.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/icHgdjy/anonymous_texting_app_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390641/normal_6002daeb5d6d4.pdfIn PDF document text
    • http://getbuiss.online/lolobejalexi08qx5.pdfIn PDF document text
    • https://cdn.sqhk.co/torevebeti/uSKgdfG/julebugurikavali.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/nipofutanagajaxilonur.pdfIn PDF document text
    • http://znakomstva69.space/classic_leveling_guide_undeady9pr8.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/xenawi_gamix_vugunabasu.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/xakusineba/41333745577.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/monofifigewodibegogebu.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/luvosodiziwokixo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/dawewaxateriboxosivi.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_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 5388 bytes
SHA-256: f2a199c56128b423f04bc55b2b04f53e59bc79982aafff7dc5e1b59a10423568
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 10436 bytes
SHA-256: 402c43f9608a6e197b877a2214dc5089152bfb7db76551032b1d89220a6b5510

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