Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72bbefdbf1db135…

MALICIOUS

PDF

76.8 KB Created: 2020-12-21 02:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5935e65da3da96ccb7388940169f78d7 SHA-1: e7d08355a57ebdbb9c94d402636f4a28747c58d0 SHA-256: f72bbefdbf1db135e9fecb90dbf265abfa5a92dd0ee958849d7818ee76e396dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farms to manipulate search engine rankings or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URL 'https://trafffi.ru/strik?utm_term=drum+set+prices+in+nigeria' and the linked PDF 'https://static.s123-cdn-static.com/uploads/4417998/normal_5fc4c6d77b471.pdf' are the primary indicators of compromise, likely serving as lures or initial download points.

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://trafffi.ru/strik?utm_term=drum+set+prices+in+nigeria
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fc4c6d77b471.pdf
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fba182972481.pdf
    • https://cdn-cms.f-static.net/uploads/4459165/normal_5fa932551fcb5.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f89de5289c9c.pdf
    • https://cdn-cms.f-static.net/uploads/4446034/normal_5fad655463bf2.pdf
    • https://cdn-cms.f-static.net/uploads/4381737/normal_5f96bec2ba93a.pdf
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/cc0540ac4e20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static1.squarespace.com/static/5fc53974ff13940aa25be6a7/t/5fc8dc99ec83506b04847b0c/1606999194505/20021310269.pdf
    • https://uploads.strikinglycdn.com/files/9db6a17c-c035-4a41-a3ba-29149879418a/hypos_and_hypers.pdf
    • https://static1.squarespace.com/static/5fdf3334fc47ae79f609b20d/t/5fdf50f98afbbc27176f7746/1608470777933/andi_bernadee_donde_mp4.pdf
    • https://s3.amazonaws.com/xupovobejanam/recompensa_total_banorte_catalogo_2018.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_off0000e39c.bin
5e111e93d931a7b47ef7896caa666da251c838110574f1270a11bb3841a274f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39C 4992 bytes
font_01_sfnt_off0000f47d.bin
d3fe54d3c589745bd095eae4714b3a02d92ca1dfde2e233f4d74009798734320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10612 bytes
font_02_sfnt_off00011888.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 4324 bytes

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