Malicious PDF — malware analysis report

Static analysis result for SHA-256 77178c93de94788a…

MALICIOUS

PDF

89.0 KB Created: 2020-12-03 21:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a80d59b3897a8409d5109d3e152bd23 SHA-1: e3bf0765a130a79106e72de10cd3103523484e03 SHA-256: 77178c93de94788a5372a17c34c52165c5bddb0ce0d0491d893eeca8615ab7fc
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a phishing trojan. It contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting an SEO link farm or phishing campaign. The primary redirector URL is https://traffset.ru/123?utm_term=retropie+arcade+games+list, which is likely used to funnel traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffset.ru/123?utm_term=retropie+arcade+games+list PDF link annotation
    • https://wukaxasupureje.weebly.com/uploads/1/3/4/4/134440875/bogex_wesokevefukuv_gewisax_ridafanadojatib.pdfIn PDF document text
    • https://rufijaduruki.weebly.com/uploads/1/3/4/3/134311805/c52e86cb4.pdfIn PDF document text
    • https://wojasatog.weebly.com/uploads/1/3/4/7/134765175/wikejoragime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_5fbea7bf0e448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f8f19a5acf2c.pdfIn PDF document text
    • https://muwubuzegutan.weebly.com/uploads/1/3/4/6/134649477/39170463a8f68.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/tobosajidut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f88310a5c008.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/wenobagupexekap/bol_chudiya_bol_kangna_music.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/22729267413.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/kipajaren.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/new_balance_sheet_format.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00011f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 5400 bytes
SHA-256: 82dca94b1b3ee02c228d3acf44ac2a5277994da76f1c72aa00d5486b1e705d3a
font_01_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 10812 bytes
SHA-256: 6d4fee194aed0292f458d06a82b5948d0d3ddba4baa69ccd3962573cb27e8479

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