Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff91b29abda95c2…

MALICIOUS

PDF

71.7 KB Created: 2020-11-16 17:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ae6de439451ef149c4039c351a9174d8 SHA-1: d9d562d1964e844683a5887570643ece7e4226f1 SHA-256: fff91b29abda95c222ec8571b5d86e7db553fa3248a174e10416859181478198
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://traffine.ru/123?utm_term=feedback+mechanisms+pogil+answer+key+ap+biology PDF link annotation
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/sidimefuvusazin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_5fa15b69ad7b1.pdfIn PDF document text
    • https://vuriluwaloseg.weebly.com/uploads/1/3/4/4/134492921/58cc93f7d81.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/242e89cb-0773-4781-93e3-02cb0b625436/keguzakenorefububidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0723799d-235a-442d-a57c-5f9512010d61/78751532851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612c816d-5461-45c6-aa3f-de5e268afbc0/max_the_mighty_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5d7682-c482-420b-b37b-69f305f474fc/sprinter_hacked_unblocked_77.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfe2104-ada9-4ff7-b191-57e0a9420aeb/58772857519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85276454-0673-42c2-bd88-e0f92fccecf9/87182286062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037ed417-a4fe-4de7-bcf0-490ac4cd290e/33349562298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3668e334-32f1-4667-8dbd-df82327d0787/32995006848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662a6545-ae36-4ebb-8876-37f29962ff94/page_de_garde_pour_cahier_despagnol.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 5840 bytes
SHA-256: 23d5fb069a5ae7ae46638c2cdf1d677efa9602274f743f168f12026d281f9b45
font_01_sfnt_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 12116 bytes
SHA-256: 938fc8ca3ce1b77ab4bed24741a71c1ae25a4376a4c2a71b46a34dba606da39e

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