PDF malware analysis — malicious · d221a5cceeb83e73

MALICIOUS

PDF

82.0 KB Created: 2020-11-25 12:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2c605ba9cbd45c54240f71d7eed83a9e SHA-1: d4064570c797fa5434d4025b4429b4b6ddcf013f SHA-256: d221a5cceeb83e732159ce51c24d2e58c2a0613836dd3b72e74e62e6e98a116d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of external links and the overall heuristic firings suggest this PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=exploring+classification+of+matter+worksheet+answers
- https://cdn-cms.f-static.net/uploads/4422631/normal_5faf469243011.pdf
- https://raxisova.weebly.com/uploads/1/3/4/4/134494277/jitimikazu.pdf
- https://cdn-cms.f-static.net/uploads/4410186/normal_5f93ec229088c.pdf
- https://cdn-cms.f-static.net/uploads/4466370/normal_5fa7be8f39c52.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/sugaguxagu/kapogusamikisuvup.pdf
- https://s3.amazonaws.com/jozetej/ielts_reading_test_with_answer_key.pdf
- https://s3.amazonaws.com/wibadinavosunom/30241938319.pdf
- https://uploads.strikinglycdn.com/files/560e47bc-5406-4b8b-b195-a00624d33d1a/mermaid_chronicles_part_1_she_creature_2001.pdf
- https://s3.amazonaws.com/felasorarabipis/acet_previous_year_question_papers.pdf
- https://s3.amazonaws.com/dobesogum/44505976064.pdf
- https://s3.amazonaws.com/metakibeme/android_rooted_phone.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000101ac.bin` `babe8cad03bbef32b2650c1a91bf869c64b1763f2f8a15d8ea4bf57ca5c61741`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x101AC	5608 bytes
`font_01_sfnt_off000114b6.bin` `0be820cec85c46b5da646c29eb1df2cb449448ebe981b308e5af9b1621f4a9b1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114B6	11148 bytes

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