Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e71059500cd39c…

MALICIOUS

PDF

77.7 KB Created: 2021-01-11 16:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f4ab83f56e7c8669a17c66ef9286366 SHA-1: dcbefb612613c680a1dd2d085a83c24f4c5fabb4 SHA-256: d4e71059500cd39c2d561f949c8e7af66735534abf1fba535e0caaf580414e50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. The file's purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffset.ru/aws?utm_term=shapes+and+relative+energies+of+spdf+orbitals
    • https://site-1171905.mozfiles.com/files/1171905/grand_theft_auto_vice_city_cheats_xbox_1.pdf
    • https://site-1196465.mozfiles.com/files/1196465/vs_code_command_line.pdf
    • https://cdn-cms.f-static.net/uploads/4449395/normal_5fafe16d7be4a.pdf
    • https://site-1166710.mozfiles.com/files/1166710/moto_traffic_race_2_download.pdf
    • https://static.s123-cdn-static.com/uploads/4474170/normal_5ff23e55968fe.pdf
    • https://site-1171754.mozfiles.com/files/1171754/matheson_park_miami.pdf
    • https://site-1174025.mozfiles.com/files/1174025/blockbuild_craft_your_dream_world_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4475219/normal_5fe69ceb0b381.pdf
    • https://static.s123-cdn-static.com/uploads/4374839/normal_5fcf4f9520178.pdf
    • https://static.s123-cdn-static.com/uploads/4470678/normal_5fc4a76012e03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/daraniwekamidir/revipazoletedozuj.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_off0000efa4.bin
292916694975343192b57423d6c635ff96716405c843cc8bd9dec66db446b783
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 5604 bytes
font_01_sfnt_off000102ab.bin
e17182ad4443fad479651b73775e6d03466ec7809d3f039f73093d31110341a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 11476 bytes