Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c23ecf1ff9bf75…

MALICIOUS

PDF

66.5 KB Created: 2021-06-06 22:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959228f7985e87bd8ac20548ad5f3399 SHA-1: bad224cef6c93dfa342c9f1cdc48a422e924c80c SHA-256: 67c23ecf1ff9bf7523557f91aa5406e1937a3f58b75f0d4c3523d4853e7b4c0e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://queure.ru/pbw?utm_term=what+are+some+talents+or+skills
    • https://cdn-cms.f-static.net/uploads/4490366/normal_60500ccf9a265.pdf
    • https://cdn-cms.f-static.net/uploads/4422645/normal_60698aad1dba4.pdf
    • https://cdn-cms.f-static.net/uploads/4418191/normal_60274de5745b1.pdf
    • https://cdn-cms.f-static.net/uploads/4500692/normal_5fe9852de2ff0.pdf
    • https://cdn-cms.f-static.net/uploads/4378164/normal_604922b96c5d1.pdf
    • https://cdn-cms.f-static.net/uploads/4405206/normal_6044fcf66ace1.pdf
    • https://pezulotum.weebly.com/uploads/1/3/1/4/131483557/899298.pdf
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fc936c50a356.pdf
    • https://static.s123-cdn-static.com/uploads/4478134/normal_5fde4b399f5e4.pdf
    • https://kavovukabej.weebly.com/uploads/1/3/4/6/134621515/nugojelomopivokulofe.pdf
    • https://cdn-cms.f-static.net/uploads/4500668/normal_603c5c4200ade.pdf
    • https://static.s123-cdn-static.com/uploads/4380540/normal_5fe0b21877e09.pdf
    • https://static.s123-cdn-static.com/uploads/4485310/normal_60029112c616e.pdf
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5fe9970d29824.pdf
    • https://gofezirorelude.weebly.com/uploads/1/3/4/4/134486205/4536375.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ririgifavem.pbworks.com/f/17549931428.pdf
    • http://zuvevetub.pbworks.com/w/file/fetch/144565653/17393186894.pdf
    • http://wigonewakil.pbworks.com/f/there_is_there_are_questions_and_short_answers_exercises.pdf
    • http://detomipipu.pbworks.com/f/1st_angle_and_3rd_angle_projection.pdf
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413526/fokolodinurakasitezo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d522.bin
4c80b149eec500788206f83ee77c2bb1711621467de6fb5cd6debe31f139c4c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 5000 bytes
font_01_sfnt_off0000e602.bin
4b61e96f5618d2f27405a7ee1c17e093c9bee8dbec116a8e706991d420aa761a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 10532 bytes