Malicious PDF — malware analysis report

Static analysis result for SHA-256 702f0e547188b1cc…

MALICIOUS

PDF

69.6 KB Created: 2021-01-08 10:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b713670ff2bc65f741e32758f736e66c SHA-1: 881c0aab33bcb56be85a2d3c3e83cc47241b5a9f SHA-256: 702f0e547188b1cc86a7de0977ef5278061fbb49f32c4112c73f00232e01d1ec
136 Risk Score

Malware Insights

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

The PDF file contains a high-severity heuristic firing indicating it is a redirector link for free-download phishing. The embedded URL, https://trafficel.ru/aws?utm_term=affinity+photo+workbook, is likely the malicious link presented to the user. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9560

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/aws?utm_term=affinity+photo+workbook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468843/normal_5fddd3262c400.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/C14Fjgf/tusuzobodiwutixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_5f8fff0e407e1.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/hjEuOhf/maybank_ezypay_plus_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_5fad9c05ac4e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/hbghv6E/20438472239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5f8c9b9b1c0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472488/normal_5fb3013c57434.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/donarepemi/32094951950.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/software_per_biglietti_da_visita_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/fifa_442_formation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/marvel_heroes_3d_wallpaper.pdfIn 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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 4956 bytes
SHA-256: 91aa3d856ed99d35167c603da954f75ccc2d7d8385d63c9863cf7f8c8d082c7d
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 11064 bytes
SHA-256: 28f09818a566aa1f8ac08bd90640b3b306c918ed265eb7de6dfb708b2a631810