Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe3f0329fb2e786c…

MALICIOUS

PDF

68.7 KB Created: 2020-12-14 13:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bc62efc741a45b12dff15bd6f547c5c0 SHA-1: 9d94f2ad8d617cbea5d495f9d757dbcae3bf2ff0 SHA-256: fe3f0329fb2e786cede9118e3fdf3ffb3e6110c277d6ea9bad2f9f4a2e993ab0
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 0.9998

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://trafffi.ru/strik?utm_term=ohio+state+university+club+volleyball+tournaments+2018 PDF link annotation
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/morex-wokom-xodesoj.pdfIn PDF document text
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/596365.pdfIn PDF document text
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/zomerorujapulenu.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/dc211232-b1a6-49c0-83cf-9fa7340d35ad/22669941312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f886d9-4cee-45e5-b406-214b7caa09c3/4155141826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d761f911-42c6-49c7-92e3-a3f5f1adfec5/kirby_vacuum_sentria_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f6ae00-a925-431f-9eb9-26bf9184387a/mad_magazine_stranger_things_downloa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54606dc0-61ff-450a-8559-e958e50b18f0/favewakidurigopesov.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/wulopifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31ff9fd1-f629-4d47-a982-ea493359689c/sto_temporal_negotiator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beadefc2-59db-4734-97c9-2ce141ee69c0/javelin_5e_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07cd167-6f39-48d8-919d-60bcaf269051/60331097634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9b4ec4-2c80-4fa9-ac4a-1a81e9ca84b0/mujinixozaluwedekemevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c3056dd-af5a-4ed7-834f-eb1b0b497fe4/solibizejilu.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/13069413458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91405742-c09c-48e1-92b4-a9cb63554807/kahoot_hack_auto_answer.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_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 5888 bytes
SHA-256: b9a64b1c934d91ec237373cc379e5e12723a90907dc64e36943695cb074d8bd6
font_01_sfnt_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 11740 bytes
SHA-256: 18bd02986436c5145a9a086ea79f77dd0c1ebce6ff28b050b7c68524950dc2fd

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