Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f408a88e03dd01…

MALICIOUS

PDF

65.4 KB Created: 2021-03-10 16:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e49e7e81c7ef40c2d85e0f50e580c4c3 SHA-1: 05238c8e5a5571dfc60564d9994ccbfe9d103349 SHA-256: 70f408a88e03dd019b383b38bacbb6b5189a63f436c1e6128e4cc628e51df734
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure designed to lead users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms, further supporting the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9763

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.
  • 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.
  • 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 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=anesthesia+machine+manual+pdf
    • http://kunepuvobimamin.medianewsonline.com/28413767521.pdf
    • https://cdn-cms.f-static.net/uploads/4393029/normal_602b7bef0b015.pdf
    • http://kafujaguvo.mygamesonline.org/31353297655.pdf
    • http://jotositafi.22web.org/how_to_add_power_steering_fluid_to_a_2010_chevy_malibu.pdf
    • https://static.s123-cdn-static.com/uploads/4484126/normal_5ff30e947019a.pdf
    • https://static.s123-cdn-static.com/uploads/4490375/normal_5fe2d81be55be.pdf
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5fe4e5c1b0656.pdf
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5fde171f981fa.pdf
    • http://fakosujonipej.iblogger.org/argumentative_essay_on_why_college_is_important.pdf
    • https://static.s123-cdn-static.com/uploads/4382621/normal_6008f586a9fc6.pdf
    • https://static.s123-cdn-static.com/uploads/4474985/normal_600267008eda3.pdf
    • http://bagerisevi.scienceontheweb.net/tulilufewumagarapi.pdf
    • http://gisoboxizaza.mygamesonline.org/critical_thinking_skills_test.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_9b01b86cc47946b3809215d77d691c4a.pdf?index=true
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_15663caa96e64a62a4c2e258a487d5e5.pdf?index=true
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_7b35934da113491080e87351ccd1d507.pdf?index=true
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_d9bfe9fb75b94236a82ff41e64cd199f.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_ec64c738be104b4d9e876aa5d052d24a.pdf?index=true
    • http://biledimetiwen.epizy.com/fomoxodarosuzemuredo.pdf
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_ee6cec7eca53444bb557a89eca935148.pdf?index=true
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_97b06a421e4e4a5e9af314a9c495dc2d.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf03.bin
bbee529dfdad79992d609fb0165caa2ffebcad5c5311d7ffbe8fa4840cdb9bd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF03 5288 bytes
font_01_sfnt_off0000e0e1.bin
a1ab979a2b37c158c9a9c52d2d55a0bc5447abebe783ad09a4ebd73d2c6c2462		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 9780 bytes

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