Malicious PDF — malware analysis report

Static analysis result for SHA-256 8338a63b94ae499a…

MALICIOUS

PDF

70.7 KB Created: 2020-11-19 07:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 690e9697be3e1ce6b3c40fb11db97b4e SHA-1: 1fa8b76146793061e5bfbc63a3e0b691aac64b7a SHA-256: 8338a63b94ae499ae441a06a34b8eb0642f104de12ec45ff1d73e1ae25f5e01b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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/123?utm_term=osrs+barbarian+firemaking+guide
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/midutabonijovuzopa.pdf
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/8147096.pdf
    • https://rinumobepora.weebly.com/uploads/1/3/4/3/134377952/mozowaxefujukavilur.pdf
    • https://cdn-cms.f-static.net/uploads/4384143/normal_5f8e43bd589f8.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/nofezokepafepilufusi.pdf
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f9f461dabbc1.pdf
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/b8f5d02fa64a.pdf
    • https://luwutike.weebly.com/uploads/1/3/4/5/134518400/lupebulumup_vowotokob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a8c955d1-901b-4229-a2ef-da8ef6c31071/hm_rpg_guide.pdf
    • https://uploads.strikinglycdn.com/files/62bf4d96-9e05-4a04-8285-65c9a7105cdd/mekodakejor.pdf
    • https://s3.amazonaws.com/tibanepoxilibud/30589817074.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_off0000cb0a.bin
91c3cb19ea69c3a24aa327733656aed77f0f4ddb8e74c777d29ab6545b0cebc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 5120 bytes
font_01_sfnt_off0000dc51.bin
7399cb362f1946530f2c5aa3dd5dec00ac884b357a81086934cc31f060ff3b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 10408 bytes
font_02_sfnt_off0000fffa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.