Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2d7b88bcec41bc…

MALICIOUS

PDF

74.7 KB Created: 2021-04-28 20:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ba2efe93fde12f4cba19b6e6c00bb41 SHA-1: 9c8a1abf21d4efc00ccb54459b4165f21419e347 SHA-256: de2d7b88bcec41bc42740bef658f39bc5d177b0a2ada94d27b91515f0421c322
186 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 6

  • 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.
  • 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://bologen.ru/strik?utm_term=clubbed+to+death+piano+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd671c92cefc.pdfIn PDF document text
    • https://cdn.sqhk.co/kunimanujage/ZYhihhY/king_of_hell_manga_romance.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/j9Qx4Zl/xebox.pdfIn PDF document text
    • https://cdn.sqhk.co/xeposetuge/ifZjhhc/87541355563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5fdb598b12088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_6069ff257ad5a.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/idjeijv/41165840872.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/Thjge5z/gmail_customer_service_chat_online.pdfIn PDF document text
    • https://cdn.sqhk.co/ninubisidire/igcgixI/43857179771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_603f7d587ea84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_6033854955c6b.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/iiJgcyV/13470880344.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/b1b9f772-d07c-4e80-b6e5-f4b37316dd8e/gexadanajufonumaluso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822ecac7-a7ef-4209-84ad-88c197d2d677/the_man_in_the_high_castle_season_2_episode_2_cast.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_67ab395b8b3c420ea0386e8326ab07d1.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_0dbdd093f4a34bc19d8eabc8d3911230.pdf?index=trueIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_95dbf75ee5bf45a082e3d77339ed3a05.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_e0164adb0a8d4862a16a167dc52799e0.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_39812d78e51e47d89ddbda93f4b242ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizoli/presto_dehydro_digital_electric_food_dehydrator_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/company_of_heroes_2_us_forces_guide.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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 5096 bytes
SHA-256: c5b424f72ddcc2539551e25e718d8e6761727f6018aa4bccd29f6ac9df01e8b9
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 11588 bytes
SHA-256: 0faff39a9f374a562465a9b531ac57b5e4f52174ba7a3e6849737a674b540277

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