Malicious PDF — malware analysis report

Static analysis result for SHA-256 72299ff83235cdcb…

MALICIOUS

PDF

66.8 KB Created: 2020-11-17 03:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5240e8e0952ef017ff17886196aacb SHA-1: 57e0e25ccbc150119652a097aae8f2da22233756 SHA-256: 72299ff83235cdcbd21e08a14f18dad7dccd82b60ead9ed4dc203e40254c3508
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. One prominent URL, 'https://traffnew.ru/strik?utm_term=rubik%2527s+cube+user+manual', is directly linked to the document's apparent lure. The presence of ClamAV and ML heuristic firings, along with the PDF_SEO_LINK_FARM detection, strongly indicates malicious intent, likely to redirect users to a phishing or malware distribution site.

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://traffnew.ru/strik?utm_term=rubik%2527s+cube+user+manual
    • https://cdn-cms.f-static.net/uploads/4381756/normal_5f9e944d253f6.pdf
    • https://cdn-cms.f-static.net/uploads/4423752/normal_5f9a12817d40a.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f98c094cb002.pdf
    • https://cdn-cms.f-static.net/uploads/4495400/normal_5fad401698c1a.pdf
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8ed59ae12a7.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/89a767.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dadac372-dda5-4d8e-8946-fd29b2d48cf1/xeketitobopepumomepeno.pdf
    • https://uploads.strikinglycdn.com/files/a5436221-c395-4932-a4f2-de1479a07ff9/bokovekijojavelamesafawa.pdf
    • https://uploads.strikinglycdn.com/files/45600e2b-f95a-4606-b94f-889e0833743d/high_performance_habits_espaol.pdf
    • https://s3.amazonaws.com/radubozufiwo/lezedoxi.pdf
    • https://s3.amazonaws.com/fofeguj/bronkopneumonia_idai.pdf
    • https://s3.amazonaws.com/gelawiweza/hotmail_sign_in_email_inbox.pdf
    • https://uploads.strikinglycdn.com/files/52599e09-c87c-4bcd-a548-fd01c645390d/54369715431.pdf
    • https://s3.amazonaws.com/woxewiwupir/behavioral_interview_questions_and_answers_information_technology.pdf
    • https://uploads.strikinglycdn.com/files/19fee667-ef13-42d8-bb7b-43658d632f32/hunter_solar_sync_manual.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_off0000c978.bin
6bab79823525529df5a3e4b14c7457b29397ecbf9e6614d111549ba017b4333a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 5188 bytes
font_01_sfnt_off0000db14.bin
b5b79d06f008d59139a75e0c8ab02da1f31e54f2039580150c57eef7f02d1e55
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10596 bytes