Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c00f7aca7d4993…

MALICIOUS

PDF

73.2 KB Created: 2021-01-04 17:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 009fc90d9d493a7ebc0863ed050ced70 SHA-1: 7ca3cd7e0fed6d860cf71727e34fce7560b8ae50 SHA-256: a3c00f7aca7d4993af08bedef52b308b6dbfc4afb52e57c168f156a939310ea6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'shaandaar video song' in the document body and a URL parameter indicates an attempt to entice users to click through to potentially malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/aws?utm_term=shaandaar+video+song PDF link annotation
    • https://cdn.sqhk.co/rewazexi/dLjd8J7/92465177864.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/ifK5v0u/brain_games_free_download_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zifalulog/jb9lRgi/lalezosax.pdfIn PDF document text
    • https://zejizatuziw.weebly.com/uploads/1/3/0/7/130739720/e5d3c2a.pdfIn PDF document text
    • https://xeligedijeka.weebly.com/uploads/1/3/1/0/131070237/regogesilape.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/egjih5s/sledziona_totalna_biologia.pdfIn PDF document text
    • https://cdn.sqhk.co/mefomixut/NJjeShU/download_music_folder_player_free.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/jelenofaledif-nunibapikire-noboridezaru-betuzelarimali.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/MLhhnZK/word_collect_cheat_level_338.pdfIn PDF document text
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/givorovemopapi.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/6343447.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/jebokizez/34565827632.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/vuwumikukozebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc55898-dcbf-4146-8ecc-902bb5097cb5/drag_racing_3d_mod_apk_revdl.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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 5216 bytes
SHA-256: b50a2d6ef3a21cb6a091c1596f16ca25cde98a5498a2a9f7691de56a309d3d08
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 11376 bytes
SHA-256: 55669226aedd9f4300f9c78f1d721c49cd507acfd468f25c8c41f93721248272

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