Malicious PDF — malware analysis report

Static analysis result for SHA-256 43081006c5438dfe…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 16:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b79874bf5e52de164dad0d55dc344b4 SHA-1: 1b76b6ece61ede5301f9670b19d224cf8c05e15f SHA-256: 43081006c5438dfebdc31ecbc1ab8c497d8114a394c409919a01e97f56bb8841
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to game guides, likely to disguise the malicious intent. The presence of multiple disposable hosting domains and a high ML classifier score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://yafferge.ru/award?keyword=civ+6+gathering+storm+starting+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4502870/normal_5fc8fd2951068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5fe924c01a88f.pdfIn PDF document text
    • http://eurofamily.pro/zelukivoludebarevago133od.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_602d4b32edd24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa56c1b8bc.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/ananda_vikatan_news_about_ajitheks97.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/the_law_of_success_book_in_hindi_price.pdfIn PDF document text
    • http://changepass.online/147344434067r2mn.pdfIn PDF document text
    • http://shopbest.online/alex_rider_stormbreaker_book_quotess4sia.pdfIn PDF document text
    • http://stnold.com/66783865074e9bpo.pdfIn PDF document text
    • https://mipurilor.weebly.com/uploads/1/3/1/0/131071035/441445.pdfIn PDF document text
    • http://amsidisi.xyz/entry_level_police_officer_exam_study_guide6oeff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382789/normal_5ff5f6673f5db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_601fbf4452f17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC9 5328 bytes
SHA-256: b8164b6b8a9654ceb92bb9ff6b0464e25914fe5560ad5375ffd7225ccd7c169f
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10228 bytes
SHA-256: 66e2e1a6fd5a14d15c7c09fb16c94e196da175547192bc32d6a2625bb72c6cea

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