Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb34e5b623ededc…

MALICIOUS

PDF

70.2 KB Created: 2021-01-12 10:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fab1087941772dd224b7749bf2626b62 SHA-1: a0ccc7dfa2da36610d497f02b5bfe618ecc5a28f SHA-256: efb34e5b623ededc215efd57182279b8ecf528883e7900686c5f311fcf193d1e
164 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. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic. One of the extracted URLs, 'https://trafffi.ru/aws?utm_term=area+of+a+segment+worksheet+kuta', appears to be part of this malicious infrastructure. The presence of a 'Download Button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=area+of+a+segment+worksheet+kuta PDF link annotation
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/nenetabewaxifo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467017/normal_5fe044af9f9b4.pdfIn PDF document text
    • https://dugilosokufaku.weebly.com/uploads/1/3/4/6/134610324/munixawolimolulu.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/wejerarurujuwip-jozad-kazakufesabo.pdfIn PDF document text
    • https://bafupenog.weebly.com/uploads/1/3/4/1/134131575/18db5dbe1dea03d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fcc9da9904c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_5fac4ce096a38.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/302f3f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f87d11d21944.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/rimepusox/javascript_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/vuwodokaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/centrale_vapeur_philips_perfectcare_performer.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/osx_folder_icon_template.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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 5292 bytes
SHA-256: d2677e9636a461a56b7c34bff2a010e7aa43d49662cd898e594fd8a7bb2e0ecd
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 10400 bytes
SHA-256: 7185481dd1ab3e3ac4b7efcaffa389f51c96043733c070d58923a63a3029bede

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