Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cb702cb35a0952…

MALICIOUS

PDF

77.6 KB Created: 2021-01-31 11:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0946a5e320586ced86b5e855a7b2406f SHA-1: 27845637baf8083701266e005357efe2d41d9ae8 SHA-256: 64cb702cb35a095266ef7ea437072f987166f33111e09eec1410d636f5d09ab4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to disposable hosting services, likely to distribute phishing content or malware. The embedded document body text, though heavily obfuscated, contains references to 'chef town cooking simulation mod apk' and 'wkhtmltopdf', suggesting a lure for potentially unwanted software or game cheats.

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://trafftec.ru/wb?keyword=chef%20town%20cooking%20simulation%20mod%20apk PDF link annotation
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/donizetopazowigovop.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/tezesogidub.pdfIn PDF document text
    • http://pirizatifi.iblogger.org/53205688819.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/dovaguje-lexevuligena.pdfIn PDF document text
    • https://wabobileminila.weebly.com/uploads/1/3/5/4/135400898/932acb835b1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5fd28aeb80733.pdfIn PDF document text
    • http://mibewoz.22web.org/acronis_true_image_free_windows_10.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/2090362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd77094be369.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486193/normal_5fc64dd264520.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/suxajetewofunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458148/normal_5fff0e58cb315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_6008a8b1f382c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zifawikixeliba.epizy.com/74911642898.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 5532 bytes
SHA-256: 361a96cbb58bf4e17b39211ac1ae921c13360c713a8e598ba9526c2ed83b708a
font_01_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 10272 bytes
SHA-256: eac49f3c6f48627186a020218c757bf4e7a16f7ec79ca10454408e709bd27093
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 12540 bytes
SHA-256: 079f4b32f3484e306fc84e2be7d483b8cd4ddb0d467c52564e95704052677fad

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