Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c48785e1425411e…

MALICIOUS

PDF

71.4 KB Created: 2020-12-27 16:48:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ef7cccf277bb5dc5756e27f06f2506b SHA-1: e985b80a35ed8cd22dde23b14ff7aad632949753 SHA-256: 0c48785e1425411e3b0969a1fffb264be5c1fbd0c45a7d91be9941d0487d947f
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://trafficel.ru/strik?utm_term=star+wars+galaxy+of+heroes+forum+pl
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/rupomiro.pdf
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f96899310cf9.pdf
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5fe1b949ddc91.pdf
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/8975645.pdf
    • https://cdn.sqhk.co/mebinolopuf/5HWijXS/brawl_troopers_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5f87b3205cc45.pdf
    • https://cdn-cms.f-static.net/uploads/4445871/normal_5fc1c8bd2375f.pdf
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/7d83c2116.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8ea3ded-f77a-4451-be23-e216a405099a/34723953621.pdf
    • https://s3.amazonaws.com/rixevozajixezos/71398908560.pdf
    • https://uploads.strikinglycdn.com/files/3d94bff4-fbd7-407b-9c8f-650cec3cae85/download_taken_2.pdf
    • https://uploads.strikinglycdn.com/files/776ae0ed-0a4c-4f25-bb0c-d6e54730f233/new_mexico_school_closings_and_delays.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_off0000d74c.bin
84b070995ff6a1cfb07dc190e7d617e964e06e370a45b13eb2d6dd360e935147
pdf-font-stream PDF embedded font (sfnt) at offset 0xD74C 5680 bytes
font_01_sfnt_off0000ea94.bin
78b5155e8418c247e9ee547efab96b5187b1e4c7b46ff08b7a16f36abefd0b9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 11264 bytes