Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9d5fe6d51db3e9…

MALICIOUS

PDF

88.7 KB Created: 2021-01-08 17:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 20e1b3414e940f654578534a43d3141c SHA-1: c1ba1774ae9f23ed8533d4c6c1adebcce7caa6d4 SHA-256: 4c9d5fe6d51db3e94203a24bbdedbe3ad1fd38598d61214ccd16d4c6e3ace9cd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with one pointing to a suspicious domain ('trafficel.ru') that is likely part of a link farm or phishing operation. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, potentially for SEO abuse or to host further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/aws?utm_term=android+arch+components+dependency PDF link annotation
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/fafewedifilitaz_jizilefale_wizikexo_jatize.pdfIn PDF document text
    • https://mutalexo.weebly.com/uploads/1/3/1/8/131871787/e50e4098f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c466fbc5-f2e7-48b6-ad28-0411640caf40/27689520119.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/lixobonepomivum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60181b80-6ecb-4e65-9f64-80425bc44d0e/nefaroruzud.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/classifying_real_numbers_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/8856380620.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/building_construction_project_report_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/domain_of_kourna_poi.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/43286086707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254b65e9-7517-4cda-b90e-11a37eb61602/religious_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/robbery_bob_2_mod_apk_home.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_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 5372 bytes
SHA-256: cef21c6888ad5208e44c1a287c42e171b8548641b40ce29c243e58bc264efd27
font_01_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 15472 bytes
SHA-256: 16d8afb6b9db6a54b9411ceaa8e3987a84f9d72996728c9ee2d9db0bbfbf3917

Open this report in the interactive analyzer, or submit your own file for analysis.