Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd87c8e43d3fd37…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 21:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 504e86546aa321064b4fcdd6ab0db15d SHA-1: b497a491cafb3fb1ecdf72a3f932880a2a6245d0 SHA-256: 9bd87c8e43d3fd37090343a373e81a5e11bfeb09948f010377515fdccc7419eb
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 pointing to Weebly-hosted PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, https://mezovuduw.ru/award?keyword=salesforce+interview+questions+and+answers+for+experienced+pdf, is presented as interview questions but likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/award?keyword=salesforce+interview+questions+and+answers+for+experienced+pdf
    • https://dujapiloxi.weebly.com/uploads/1/3/1/8/131857305/vetuwijizebef-korebubedoreg.pdf
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/857223.pdf
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/57ab4ebac1.pdf
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/5943575.pdf
    • https://cdn.sqhk.co/regomesu/fgcjiDm/66312497182.pdf
    • https://cdn.sqhk.co/tefaxobaf/mhbjgbG/wenuguvofapugukuf.pdf
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/mugekekifiki.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/985c9bf5c4.pdf
    • https://moxuludo.weebly.com/uploads/1/3/4/7/134759924/7c25c3050247bd.pdf
    • http://mejumeroxara.mywebcommunity.org/nofad.pdf
    • https://cdn.sqhk.co/xurawupo/fcNhhaY/jefabufobo.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/tiriku_tawuko_siwamonoxine_dedovowerub.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/9888744.pdf
    • http://tinesemexogo.mygamesonline.org/26095997334.pdf
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/guduwagedasor.pdf
    • http://nakalabaxis.mywebcommunity.org/business_loan_application_letter.pdf
    • https://cdn.sqhk.co/kopuzeginev/CnNjcha/85675617488.pdf
    • https://cdn.sqhk.co/mobobelelu/gehYiK6/brave_frontier_tilith_sp_build.pdf
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/329829744d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rurovikejigibu/bigawitotatexajexerolabap.pdf
    • https://s3.amazonaws.com/rivazixexuguri/sizubutuvemuzotimore.pdf
    • https://s3.amazonaws.com/rejiner/pazemujofisilevoruzojanu.pdf
    • 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_off0000fa9c.bin
4ea3f1a3b4f29d727aee96290a0853c4e2a570cceb9835d8ae40503005d8805f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 5600 bytes
font_01_sfnt_off00010dcd.bin
9abb157283fba44115e2f88ed761375d0da3e48f4b3e7ccfab709dc8f299de6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 10544 bytes

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