Malicious PDF — malware analysis report

Static analysis result for SHA-256 322d84225e1545fc…

MALICIOUS

PDF

68.6 KB Created: 2021-02-08 18:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9828ff1bfaa8f341e4e3e99d913120d3 SHA-1: c5591ffc8cd0dab1560104ee9823a0de3542e1ef SHA-256: 322d84225e1545fca0abb13e4577832dd9fe9dbd0e63771e5e292d81c4b47978
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure at `https://yafferge.ru/aws?utm_term=accounting+format+excel+definition`. The file also includes a link to `http://biwijenanun.22web.org/xamigitojanugazabulujasi.pdf`, which is hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of malicious links and the overall detection profile strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 5

  • 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.
  • 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.
  • 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/aws?utm_term=accounting+format+excel+definition
    • http://biwijenanun.22web.org/xamigitojanugazabulujasi.pdf
    • https://cdn-cms.f-static.net/uploads/4424953/normal_601fcb8e29965.pdf
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/vuwuraguwabusufabe.pdf
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5ff2c663cf13b.pdf
    • http://kozizukexepuf.22web.org/zurineraxutef.pdf
    • https://static.s123-cdn-static.com/uploads/4376086/normal_5ff5421c78b44.pdf
    • http://valamivu.22web.org/acr_call_recorder_license_pro_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4406166/normal_600bdac036c89.pdf
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/98b00f14234c.pdf
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5fc60fc69fc19.pdf
    • http://vasazuruxu.iblogger.org/jp_morgan_research_report.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://konevimojo.epizy.com/4229184869.pdf
    • https://s3.amazonaws.com/jiwisigetizoxif/vamoka.pdf
    • https://s3.amazonaws.com/xutomoxu/differentiation_questions_and_answers_gcse.pdf
    • http://mexawidojaxa.rf.gd/bca_admission_form_2018_in_delhi.pdf
    • https://s3.amazonaws.com/zizene/alice_in_wonderland_disney_story.pdf
    • http://jukasiwatan.epizy.com/letibivebuwu.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c7.bin
cd9f16a67f480742f5a548facac318d234ceeb4e9722ce868b040e3964fc9db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 5220 bytes
font_01_sfnt_off0000eb78.bin
3336632d3727d2f85d48892a6a32ddc69787c05e8e0a470ac2ab5866b1288b9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 11036 bytes

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