Malicious PDF — malware analysis report

Static analysis result for SHA-256 5241f22d11e4114b…

MALICIOUS

PDF

69.0 KB Created: 2020-12-18 18:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 30ec862011c730d804342dd440099e5b SHA-1: aef1b230532af8c0195638776a97ecd956587a44 SHA-256: 5241f22d11e4114bda62cd074831fbd607ef71eb5f32693cd3ae135975d65d7f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO abuse tactic. The primary URL, 'https://trafftec.ru/123?utm_term=how+many+words+is+4-5+pages+double+spaced', is presented as a search result to lure users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafftec.ru/123?utm_term=how+many+words+is+4-5+pages+double+spaced PDF link annotation
    • https://fupesovuzej.weebly.com/uploads/1/3/4/0/134016868/figepovet_zumofavakozafak_zazimafojutun.pdfIn PDF document text
    • https://gosasolana.weebly.com/uploads/1/3/4/5/134523876/bipogebujora-wevakopur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f9865e4860ad.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/tarajix/kukuxobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62391793-ab27-4dda-99d5-88fbf8319fb8/pubifimirox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4dbd93-40ad-4e19-b92a-12c0b8b86aa0/33946122354.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/apache_tomcat_7_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/abstract_reasoning_test_for_college_entrance_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/belling_cooker_fse60dop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/tarugupuforazugenopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50f34914-36a6-4678-9bc1-0a7d16b7d0ee/ws_7.1_specific_heat_and_calorimetry_answers.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_off0000d09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09E 5932 bytes
SHA-256: 53f996d79886c4222eb58ca99055b5c5af50aaaf4b11fda5ea35238e6b7d681e
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 9980 bytes
SHA-256: 00e6bf00222429f2299a8a258400231c77204fd826f815a7c17866d476665869

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