Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3d96b434e4f329…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 00:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: de2e261a34348516b2870160771d15ad SHA-1: aacc241727c98459c0f472f9b9631fabc8597cc0 SHA-256: 8f3d96b434e4f32954f901681efde1a32a43c8195d1e23b34df9e1c4c05d8179
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a website that appears to be a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being flagged as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to games and applications, suggesting a lure to entice users to click the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=boxing+game+online+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383577/normal_60304b72462e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451023/normal_5ff21b230eae1.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/wobezedukiw_vofijereb_nozodalizadusoj_towenufitim.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/jfhaAr4/go_launcher_prime_remove_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/PNhjijT/2198260906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_603828ae66e3c.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/cibTebA/rimugukodewozinigubiruri.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/rewifekozoponubejekajofis.pdfIn PDF document text
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/toposa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6014c805570f4.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/formal_business_letter_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_6016ec2537d6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fca67acdbb1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448115/normal_5fe0ed1468576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5ffea435000dd.pdfIn PDF document text
    • https://genepuxomo.weebly.com/uploads/1/3/6/0/136053587/34e2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459165/normal_5fcf60fe3c664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6026cd7be3c2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/wii_console_newegg.pdfIn PDF document text
    • http://gubadif.myartsonline.com/5962943240.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/9347625484.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_off0000e640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE640 5304 bytes
SHA-256: 1939f9a06993bf013abf51d41029822c7714f10de6c3854fe204ead410031b96
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10804 bytes
SHA-256: a14bc0d6b150fe98069418b4448059c52fb7bbe9bf5e444aa4a68c5e300c453d