Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a95719ae713033…

MALICIOUS

PDF

67.0 KB Created: 2021-01-06 02:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e4492009986c85eb0f70421687f4f45 SHA-1: dc59beb356007525cd6b48a9c0bd42c5bc4ee55e SHA-256: c3a95719ae713033d8cf8b1c2f4bf07eeca45b0cd51af277b421b51ee88f73c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to an S3 bucket containing 30 PDFs. The document body, though heavily obfuscated, contains text related to 'Tv guide sky sports arena', suggesting a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or distributing further malware.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=tv+guide+sky+sports+arena
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/nimakinididenif.pdf
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/df20b5c5af8e.pdf
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5f96873c5cba2.pdf
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8a5cb309629.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nunakixuma/cabinet_vision_9_free.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/52703514376.pdf
    • https://s3.amazonaws.com/bisiku/63436722229.pdf
    • https://s3.amazonaws.com/xupizewuxere/38853617007.pdf
    • https://s3.amazonaws.com/dosalapasenow/game_pirate_caribbean_hunt_mod.pdf
    • https://s3.amazonaws.com/silubebebefuju/25901957403.pdf
    • https://s3.amazonaws.com/jepinebawo/an_occurrence_at_owl_creek_bridge_in_spanish.pdf
    • https://s3.amazonaws.com/kavugusepe/tizimemumavuregevewuke.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/shadow_tech_knives_quality.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/17987438670.pdf
    • https://s3.amazonaws.com/tarizirefevifab/blackpink_boombayah_live_mp4.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_off0000c749.bin
c2a0f56f1dd6925696fac35598001f9d855b69d28191fbd892ce18ecf4c557cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC749 5268 bytes
font_01_sfnt_off0000d958.bin
8f05017747442cf7a8ad6f14b1d607497d5155af0136be928484bdd782155925
pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 11132 bytes