Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf4dc39027353b3…

MALICIOUS

PDF

65.4 KB Created: 2021-03-30 03:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e1dc6862843acccea700c12183fb3af SHA-1: d4902c3472684fd72440d5191bc76ad07c220da5 SHA-256: acf4dc39027353b38d6b916289ea0cfe6509fa82fae6f0db153ea31c87b0053a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/award?keyword=bier+markt+menu+pdf
    • http://brightshopbg.xyz/bts_answer_album_wikinmw4g.pdf
    • http://irbestate.ru/numogalofobexaplheg7.pdf
    • https://tumunuwixa.weebly.com/uploads/1/3/1/3/131384432/a244d46.pdf
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/8230095.pdf
    • https://pupadidaf.weebly.com/uploads/1/3/0/8/130873798/lulobojolegor.pdf
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/cf5bdba8d.pdf
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/kepivoso.pdf
    • https://bekodezu.weebly.com/uploads/1/3/1/8/131856725/pobijuna-musilatimonaz-zoleka-laxafekaxapogaz.pdf
    • http://govnosiakxws.online/94363512605hd85v.pdf
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/kitad.pdf
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/ef3e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xupimaral/92498290447.pdf
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_a0dfa997aee44105851eb5ac0455c8d7.pdf?index=true
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_7e0ae286a8cd49d68930897aa56aaed8.pdf?index=true
    • http://kegotetebam.epizy.com/bleacher_report_nba_position_rankings.pdf
    • https://s3.amazonaws.com/wofaxil/kileluraluronamelineraf.pdf
    • http://titarejidawe.epizy.com/what_foods_help_with_alkaline_diet.pdf
    • http://palezepebarinot.rf.gd/3525624872.pdf
    • http://kofojawiv.epizy.com/gre_math_questions_free.pdf
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_f88319d081ce4f7a8068cd23a7cc0161.pdf?index=true
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_aba4bd33c9504ea3a884a5c3692299e2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5bb.bin
48c5d8a276539b06922b88f498b011741e01d20c6d68bd1eb5e69f3f5f5db822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BB 5088 bytes
font_01_sfnt_off0000d6fc.bin
5e61260fde3694969e79f91d477f72587a6e1edd86758ae2a5f4744a9875e4ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 10076 bytes

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