Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa2bfb12cd01ed0…

MALICIOUS

PDF

66.5 KB Created: 2020-12-23 10:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3b0a8faec51c5d85633e10fc8743cb7c SHA-1: d3a44be9cfbde4792fc79fa51cc3d83a3134cf99 SHA-256: caa2bfb12cd01ed055ffbd96d5daf7e04b8a98c487fff8246bd55ba2968caf02
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being 'https://trafffi.ru/strik?utm_term=droid+depot+personality+chips'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=droid+depot+personality+chips PDF link annotation
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/0da64bbb.pdfIn PDF document text
    • https://tevitoretej.weebly.com/uploads/1/3/2/6/132680933/9867131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_5fa6a79cb81d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc14ca588c99b6d37a9dd1a/t/5fcaf1e5551bdc47e79f23c2/1607135717356/woselekifutizomuburisitu.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/godezemuwojobonirezofemu.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/10700096445.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/jogebigebobegopetonu.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/super_smash_bros_for_wii_u_cemu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/werasu.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/hess_s_law_lab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/green_smoothies_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/puwududanogeti.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/android_auto_toyota_highlander_2019.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC901 5260 bytes
SHA-256: 0cca6bc5dd7998861f14416c31d8b9be80fe419afb4048edd9f099d3e563522d
font_01_sfnt_off0000dae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE9 10152 bytes
SHA-256: b695070b3c8cb14800a174cb215882af76aa435512414b6e08fe5aff2dd828b8

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