Malicious PDF — malware analysis report

Static analysis result for SHA-256 55be26a16352037e…

MALICIOUS

PDF

67.3 KB Created: 2020-11-24 21:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a6e423762ff37ebeed35ca680d67d50 SHA-1: 52bdc10d23b35ddb70b362063b3bb4af0bb2acbc SHA-256: 55be26a16352037ecd48a3b2cb8c2e4d29ec69e13bc0d9723894a55c85e20e8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('trafficel.ru'). The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, often used to distribute malicious content or for SEO manipulation. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafficel.ru/123?utm_term=lv2+kara+cheat+datta+moto+yuusha+kouho+no+mattari+isekai+life+fandom
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5fad7d73122ec.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_5fb2de9c7419a.pdf
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/dosofijuxu_kisapivowug.pdf
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fb5447e4b351.pdf
    • https://wedagibawarog.weebly.com/uploads/1/3/4/6/134680751/ximulamusulug_zewixejis_gosokanomegago_vizojixa.pdf
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5fb5f79c28116.pdf
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/xalipugojo-sakuv-xibemeroradubu.pdf
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/6276797.pdf
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fabc7db601b9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a20cba58-47e7-47db-b6e0-4562e140b79c/pudakixifonelajize.pdf
    • https://uploads.strikinglycdn.com/files/53b89a15-15d8-4eff-87bc-8d312e54cc5f/liwuletavax.pdf
    • https://s3.amazonaws.com/visagogijulep/sport_live_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d6.bin
d02a5fddf868be04bfa0e3bfc903bd880753b0def7916e47bdd3263511495510
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 5560 bytes
font_01_sfnt_off0000daa5.bin
1ffbefa3ea8e87a8512f1e39a60725ad2ef1f75092a32f70523b9e96ca8afb54
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA5 11900 bytes