Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b474d6e669dc22…

MALICIOUS

PDF

65.9 KB Created: 2020-11-14 11:22:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 04c365f6bac6f326d4b89165ebb15f16 SHA-1: 2d09214f47d03e7ed3c461feda0a1a98395d2056 SHA-256: c1b474d6e669dc2263831b8fb2ba265d909c4e728c04192853941ad4a9c56a64
196 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of an SEO link farm and a redirector, specifically designed to lure users with a search query. The embedded URL `https://trafffi.ru/aws?utm_term=where+does+inventory+go+on+balance+sheet` and the linked PDF `https://s3.amazonaws.com/wibedubosateg/rerimenegixotexub.pdf` are key indicators of this phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=where+does+inventory+go+on+balance+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f92512ace180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5f9de427ec200.pdfIn PDF document text
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/4970859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5fae8d3f964a5.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/wibedubosateg/rerimenegixotexub.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/dazibafagafubome.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/69462782943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b83a42ad-659a-467c-ab24-d5e744410fe1/kick_2_telugu_full_movie_online_watch_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/rekaromerebur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bfd1ca5-25a1-4a20-a06f-ae56cd47be50/zoruwixapuzeperinuj.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/jibosotagelen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6511ecc-06ec-4567-9932-44447e4b0479/80724540915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60904257-c8f4-4a35-b001-c661842fc301/zadamovabidujor.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/roxosoxorew.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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 5516 bytes
SHA-256: bc8380ad503df6e005ccc77bcbd0cadc27354a8f0e455e55e55a4d459f91b907
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 9788 bytes
SHA-256: aa93cdd1747161953c5f3bbf1c171ac60504d09a55d8541c8137a30b0a2c3ebb