Malicious PDF — malware analysis report

Static analysis result for SHA-256 d623deb1748a2eef…

MALICIOUS

PDF

71.3 KB Created: 2021-01-20 04:56:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d13f95d8fb19f8575636a8425f597ec2 SHA-1: c64dfce5e12096a4ed6809a93e608407b215bdb1 SHA-256: d623deb1748a2eef7113b6043fbfd0fe6bc1ced1c6a273e2940661b5731366e3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though partially corrupted, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/wb?keyword=why%20do%20cats%20tails%20wag PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fc87eb3b38a2.pdfIn PDF document text
    • https://site-1244835.mozfiles.com/files/1244835/51334974373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5fcfab4e6eecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5fced41eebeb8.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/cPhajcT/pro_pinball_the_web_patch_1._52.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/501f48.pdfIn PDF document text
    • https://site-1246349.mozfiles.com/files/1246349/rokofeguzakivizafami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5f95f4b266792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f913afd62c37.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/7lZ6igc/fatatevagixo.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/biregutekenuned.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/hjjbnei/fejosufugikovesikene.pdfIn PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/3622022.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/suxowejif.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/tfBgglv/bomitapanaxanezasiji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakapefetabol.rf.gd/vip_betting_tips_app.pdfIn PDF document text
    • http://nabotiwufonego.epizy.com/17933606207.pdfIn PDF document text
    • http://nogobixa.epizy.com/65979806466.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_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 5312 bytes
SHA-256: 1dfa82708824fceeb2f1228e1e229285e51a0e97c8ab1dec540394f4445a9e33
font_01_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 10428 bytes
SHA-256: aa199f92e0c43f3ee62f85d377a442ab65bf4195df9d117fdb29bf1ac5ff0a3d

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