Malicious PDF — malware analysis report

Static analysis result for SHA-256 0865e7a968da6703…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 08:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82e5c5e04dcea44d7d56c531f43117f7 SHA-1: b1c238d8504edfe23be1b77d8c3fa20db4dd14b3 SHA-256: 0865e7a968da67032d060d248e0ec22ab7f716346a6e8524189efb9dd0d0ce59
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely as part of a broader phishing campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+tie+the+end+of+a+chinese+jump+rope
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/lasarak.pdf
    • https://gagetagij.weebly.com/uploads/1/3/2/6/132695244/a4da3aba098570.pdf
    • https://cdn.sqhk.co/serodozire/mnl33jh/the_walking_dead_season_10_episode_15.pdf
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5fdc73f5809c1.pdf
    • https://fekadoripegat.weebly.com/uploads/1/3/4/5/134592683/lakariduj.pdf
    • https://cdn.sqhk.co/pugudanirav/icBmZbM/44392983858.pdf
    • https://cdn.sqhk.co/vamunidibu/zBKBJje/dungeon_keeper_gold_level_4.pdf
    • https://cdn-cms.f-static.net/uploads/4407788/normal_60187ab6197dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_e6242ad5604246adb6351334becbcd51.pdf?index=true
    • https://s3.amazonaws.com/gezetega/41366310740.pdf
    • https://s3.amazonaws.com/midaguvimabof/33575398787.pdf
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_f6a10816109642dc9a5fea531596df38.pdf?index=true
    • https://s3.amazonaws.com/zarusegibitumet/camtasia_studio_free_trial.pdf
    • https://s3.amazonaws.com/potamotaz/i_caught_my_girlfriend_on_a_dating_site.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4fc.bin
b91590d1208b48a8ace25513611b51dfba94ab2b29a41318a4b38fdd6ff761f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 3956 bytes
font_01_sfnt_off000102fd.bin
34cc727b3849a43d9cf10b101802a7ec600714020c1907b8da96864b5be8e762
pdf-font-stream PDF embedded font (sfnt) at offset 0x102FD 5492 bytes
font_02_sfnt_off00011598.bin
61edc73a3a6e43f47588a6ec5a010d7748217e3113feb412524e0455615cc526
pdf-font-stream PDF embedded font (sfnt) at offset 0x11598 11960 bytes