Malicious PDF — malware analysis report

Static analysis result for SHA-256 591ef0c1b2b1c7f8…

MALICIOUS

PDF

76.9 KB Created: 2021-05-16 03:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b794498c9736f20053589a65e0573ec5 SHA-1: eba0eb2c79f1020c5372543039d33ba500791560 SHA-256: 591ef0c1b2b1c7f889f39d5894dad4671d6f85ccda65994830fb92e48a4c5242
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 0.9998

Heuristics 6

  • 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.
  • 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://xezojetit.ru/strik?utm_term=what+special+forces+has+the+best+hand+to+hand+combat PDF link annotation
    • http://lidlid.xyz/nurenesakag764f.pdfIn PDF document text
    • http://modernstyle.pro/what_continent_is_the_daintree_rainforest_inpp6bd.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/1406251.pdfIn PDF document text
    • http://d2-club.ru/devejaj9dvt8.pdfIn PDF document text
    • http://hdsamara.ru/99755480638iglco.pdfIn PDF document text
    • https://gamekesilib.weebly.com/uploads/1/3/4/8/134892139/4924009.pdfIn PDF document text
    • http://maewallace.com/minorafividawebcnlaz.pdfIn PDF document text
    • http://wegisinebirixe.iblogger.org/59639741761.pdfIn PDF document text
    • http://daating19.site/icecream_converter_for_pcmcrpr.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/9272c6c4-16a7-4491-9d44-bca0737645c3/14499823274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908727b2-58bc-4f61-b8f7-e3da635d9ef5/wired_for_story_goodreads.pdfIn PDF document text
    • http://pejabefi.rf.gd/laxawowir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd08760a-494c-4aad-bf04-23c5d3b2fead/david_raizman_history_of_modern_design_2nd_edition.pdfIn PDF document text
    • http://golagesobowe.epizy.com/what_does_rudder_mean_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28eed328-5eca-4227-89bf-661b51408689/werewolf_the_apocalypse_20th_anniversary_edition_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af7804bd-f24c-4586-8a68-e8fc755f17fc/13625887172.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5548 bytes
SHA-256: 395010c4ebc7e58859097315cfdfb484262771a6d0e2f1a5186429e02bc06403
font_01_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10884 bytes
SHA-256: 0161856e54b8f327848d2fc5203b8c9979e5ce3207ea0b30dcdca3d95b5a3ac9

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