Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96d9f6999563c18…

MALICIOUS

PDF

67.6 KB Created: 2021-02-07 08:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 59aa15e559f66bbf70ca882ee7b00629 SHA-1: 61d532d70d9d0ff57a2a207b3a7d84fc5da90051 SHA-256: c96d9f6999563c1833c2c3d0c383a7488b49fca8f2cb5ec8441bb40022b50c27
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDFs, suggesting a link farm or SEO abuse for phishing. The primary lure appears to be an 'Exxon Valdez video worksheet', directing users to a redirector URL. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8050

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://jacksth.ru/aws?utm_term=exxon+valdez+video+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5ffe94942771d.pdfIn PDF document text
    • http://womenit.space/lolos1dhbe.pdfIn PDF document text
    • https://depesusexufajev.weebly.com/uploads/1/3/5/3/135351117/9041996.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/joxamidiwiweter_musujaladide_vigitur.pdfIn PDF document text
    • https://kesizibewasi.weebly.com/uploads/1/3/0/8/130813921/5319873.pdfIn PDF document text
    • https://nibejenowazi.weebly.com/uploads/1/3/5/3/135347217/1ac022c7fada.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/9703900.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/wepiwarumurukajo.pdfIn PDF document text
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/wofisemijuwetofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezekov.rf.gd/project_experience_template.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/guider_conduire_synonymes.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/mcdouble_meal_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/tetunibisudifiwizunewere.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/kawasaki_jet_ski_stx-_15f_manual.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 5204 bytes
SHA-256: aae547fcfe1b84aa7c30f5d32665826c7b417b47c6e7406e4179617f4119b2b2