Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bb31e27dc96113…

MALICIOUS

PDF

64.7 KB Created: 2021-01-17 05:14:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4eadd93fe3aa5168237fb7b927fc941f SHA-1: b83887c779d36be75e6676ea18e43ffcfeef2bd5 SHA-256: c2bb31e27dc96113982cc2ad0e9729a599aa39290ca5a76b98bbfd9f9234e38d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, particularly those on disposable hosting and utilizing UTM parameters, suggests a link farm designed to redirect users. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'traffine.ru', reinforcing the attack pattern of directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=ascend+on+soybeans PDF link annotation
    • https://malugula.weebly.com/uploads/1/3/2/6/132695531/norodugomaxepi.pdfIn PDF document text
    • https://jujepuwajepoxox.weebly.com/uploads/1/3/4/4/134466337/muvufedenokuzo-marawutivaxuf-jatavukiv.pdfIn PDF document text
    • https://site-1244930.mozfiles.com/files/1244930/personal_action_plan_template_word.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/mivos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5fc76fd4c8776.pdfIn PDF document text
    • https://site-1166598.mozfiles.com/files/1166598/estreimiento_cronico_funcional.pdfIn PDF document text
    • https://site-1178567.mozfiles.com/files/1178567/weather_report_bangalore.pdfIn PDF document text
    • https://site-1166645.mozfiles.com/files/1166645/83749220579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nigimul/railway_station_code_india.pdfIn PDF document text
    • https://s3.amazonaws.com/sibenuvokiwuz/lubivufi.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/jiwivunoton.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_off0000c313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC313 5036 bytes
SHA-256: fae7486cc04df5951bb5c0f458bdf0c4e133f305ecdc1ca170a24bac86b32be2
font_01_sfnt_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 9968 bytes
SHA-256: 4b0500dd7523dc64ac6d7d1299575735e83633569bf520b7b572559f917bc1c7

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