Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2316c02cda5b6c…

MALICIOUS

PDF

64.7 KB Created: 2021-01-16 14:09:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a7728dabe3d5a9b3ca2ad0b3d032b10d SHA-1: 557199455d49fdeec609a01aa409be7e701c541f SHA-256: 3a2316c02cda5b6c2896c212a335e56f5d60e9c24125a759971a2479211aa59d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of multiple links to disposable hosting suggests a coordinated effort to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=bhagwa+rang+song+ringtone++likewap In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5f873d6de2769.pdfIn PDF document text
    • https://site-1177315.mozfiles.com/files/1177315/shooty_skies_overdrive_quest.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/33654884837.pdfIn PDF document text
    • https://site-1166082.mozfiles.com/files/1166082/ddpai_app_store.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/jenifowoto_gefar_gukifofufedod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_5fa08eb288d84.pdfIn PDF document text
    • https://site-1177392.mozfiles.com/files/1177392/ice_cream_cake_recipe_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/ijvds2Q/pulse_point_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_5f919db41369e.pdfIn PDF document text
    • https://jajajijonox.weebly.com/uploads/1/3/1/4/131453539/82691b1ead1.pdfIn PDF document text
    • https://muzezibabut.weebly.com/uploads/1/3/0/7/130739211/baluvalowekof.pdfIn PDF document text
    • https://site-1174930.mozfiles.com/files/1174930/8_bit_racer_offline_arcade_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 5284 bytes
SHA-256: d308671edc2b4e4897b1b98304fd87159e5ab05042002b07b52435c38bbeefd4
font_01_sfnt_off0000d197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD197 10648 bytes
SHA-256: 5783ce21340b49a51245aa0bf6c201233d67031ee47ae587037c7ba37b8af431

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