Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3e694528d88d2a…

MALICIOUS

PDF

73.7 KB Created: 2021-04-01 10:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8487d0a4d8b0c4283e81d8d30123c146 SHA-1: 41de6d19ead025b89b66ade42b774ea5631e0746 SHA-256: 1a3e694528d88d2a86d593f8ce13d2ef9c10cd93c5dfcdd7d18bf8af3e72f833
186 Risk Score

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. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate a potential for malicious redirection or content delivery. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=ciencias+sociales+5+pdf PDF link annotation
    • https://sinixamaruxibul.weebly.com/uploads/1/3/4/6/134653816/1912581.pdfIn PDF document text
    • https://penixosifa.weebly.com/uploads/1/3/1/4/131482878/7285765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_603cb064e8fdf.pdfIn PDF document text
    • http://vabapagamowese.22web.org/windows_10_iso_myegy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fdfb6e869733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_6028f4f7c7e8f.pdfIn PDF document text
    • https://boxemafal.weebly.com/uploads/1/3/3/9/133997404/nepafab.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/bhcbibE/download_game_dragon_world_mod_apk_revdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_600e49b437b25.pdfIn PDF document text
    • https://cdn.sqhk.co/xelibini/Rghibgf/8652635778.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/descargar_jurassic_world_the_game_hack_apk.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/resabomibogodaw/mariadb_documentation.pdfIn PDF document text
    • http://diwesetudu.epizy.com/82064853005.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_4bd135004991401a9a443d64465059b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/mulibizex.pdfIn PDF document text
    • http://minegavanifur.rf.gd/8a_reported_speech_sentences_and_questions.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_023ffb01b4874c979f88378fb7b2df97.pdf?index=trueIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_008d053e65cd405eb9a69640b2391e4d.pdf?index=trueIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_c2ff8e43eb5b45dfb3455fa0e7c68bba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/doxige.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 5080 bytes
SHA-256: 9fd1cb3365020ef3cde7d6b592e1056087588267c1d34a714662a44d3b60158c
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10568 bytes
SHA-256: 2f60d253a3f77e2adc74a21d86f38e9560e2211e25ff257142746b408c1347c1

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