Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1252ca580c3115…

MALICIOUS

PDF

80.3 KB Created: 2021-02-16 03:14:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6a2b8b471369abd2272a656a73114cfa SHA-1: 54222746e453ec11a833e6aed1b26d24c1b8a524 SHA-256: ad1252ca580c3115e21f99c8976e29a6b9fba74b0e2e6fc99dfd6a92b22d92e7
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://jottigo.ru/wb?keyword=financial%20algebra%20workbook%202-3%20answers PDF link annotation
    • http://runaxok.iblogger.org/acapela_tts_voices_android.pdfIn PDF document text
    • https://gilamasizate.weebly.com/uploads/1/3/0/7/130775108/ragofuwiwosamif.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/noxorabipepura-wokesejib.pdfIn PDF document text
    • https://tevunuxewime.weebly.com/uploads/1/3/1/4/131452804/2839173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_600c93eae6221.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/goludemuburoturit.pdfIn PDF document text
    • https://powelogub.weebly.com/uploads/1/3/1/8/131871449/wikesepix-wutepoxuxo.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/koxobet.pdfIn PDF document text
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/c2936c1e8f8b03e.pdfIn PDF document text
    • http://geniputan.66ghz.com/western_blotting_methods_and_protocols.pdfIn PDF document text
    • https://junanopawakeza.weebly.com/uploads/1/3/3/9/133999625/gunoxixo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xezepagonozaniw.epizy.com/free_online_baby_shower_invitations_templates.pdfIn PDF document text
    • http://dagogedimin.rf.gd/5538212389.pdfIn PDF document text
    • http://vopapatadape.epizy.com/masotezulo.pdfIn PDF document text
    • http://fidobagasamos.epizy.com/tekutewavaxesumu.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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5548 bytes
SHA-256: 162762766f3bdb57b283a91f47c50a5abaa3f9fd29b6bea6032be91aca3ca2f0
font_01_sfnt_off00010d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 11396 bytes
SHA-256: 5eed3b3c421f082eb24b540d2ee3c494bc5d5413bd216678446171287696fcc6

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