Malicious PDF — malware analysis report

Static analysis result for SHA-256 74362d72ad0153e2…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 01:16:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1268b75419692d1426325b9ab0e00cf4 SHA-1: 1162e0e55d7f8b85460cc70272b9b6660d5da5ed SHA-256: 74362d72ad0153e2a2e7fe83bccc85b01022a3c493f632a7ff6d4030b841866d
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-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://jottigo.ru/strik?utm_term=lego+rubber+band+gun+instructions+pdf PDF link annotation
    • https://cdn.sqhk.co/pekotegafod/jgIaTUk/real_car_racing_game_download_apk.pdfIn PDF document text
    • https://gupolapi.weebly.com/uploads/1/3/4/6/134629895/3529055.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ijgffjd/padunadulumojo.pdfIn PDF document text
    • https://cdn.sqhk.co/rilabotib/cZiiNhf/nutisebilo.pdfIn PDF document text
    • http://xusibuvuzos.22web.org/60003382438.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/4b447d1bdc7.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/1811211.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/lufitunelegon_pexugovu_jelobene.pdfIn PDF document text
    • https://gosevitugelaw.weebly.com/uploads/1/3/4/4/134439416/4588466.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/puwisuvexul.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/335bc60c-1b63-4183-b595-535a92878596/dd_5e_tyranny_of_dragons_magic_items.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/verb_tenses_practice_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a785c1a1-041b-474f-80a7-31e6fc991135/radomulonuwumafimela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf320fa-12c2-435a-af25-5a7268384775/how_to_calculate_building_costs.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/81242623783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d794906-8f1f-44a0-897b-18b9a355b575/research_methods_in_psychology_online_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1b33b7-ee55-46cf-9553-94e46b98fb0f/nawulifogapum.pdfIn PDF document text
    • http://xurukat.rf.gd/16628179169.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/93317954916.pdfIn PDF document text
    • http://gubadif.myartsonline.com/44209631454.pdfIn PDF document text
    • http://luregaw.onlinewebshop.net/19898755822.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5372 bytes
SHA-256: c60d1b7ed35b14969d30fcf34a1cdc717fd91a1403de7b58518f595b7d2b87f4
font_01_sfnt_off00010440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10440 10812 bytes
SHA-256: a37d2e85b55afd25c7715a218afe2faba9e31d7e957806376c1ef43c823ee1d4

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