Malicious PDF — malware analysis report

Static analysis result for SHA-256 92245c47a1e78e19…

MALICIOUS

PDF

69.0 KB Created: 2021-03-08 14:28:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a8871cd11cc77b99cbe5d72763ce54f3 SHA-1: 6551a665f14b5042b55f92582e53cfb2b44c6b8e SHA-256: 92245c47a1e78e19bb7297a2b4292c87b3e1599158abb9ad7f7580a1d8e4920a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs point to potentially malicious content or phishing sites, and the document's structure suggests it's designed to lure users to external resources.

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://jumiwimov.ru/award?keyword=advanced+mathematical+concepts+precalculus+pdf PDF link annotation
    • http://ravovenovibu.medianewsonline.com/the_seven_years_war_was_the_first_world_war._discuss.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/c8011408b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449793/normal_5fc8bb63cc132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_604109739493d.pdfIn PDF document text
    • https://vilegewadaw.weebly.com/uploads/1/3/5/3/135324537/nijevanidem.pdfIn PDF document text
    • https://vopupina.weebly.com/uploads/1/3/1/0/131070761/bad9ba31f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_6007480f62875.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/xupitibe.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/fdcacb89-711d-437e-8406-a51f50b7b441/anatomy_for_the_artist_jeno_barcsay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a267c6-3524-442d-94d6-8934fefa9e33/fukekoniviga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac33844-fb9d-458b-b7dd-f786c732f182/74486722143.pdfIn PDF document text
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_9bcd842907054be090e9efcf7681dfe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/168b0922-5d70-43d5-9726-c02f84696bc9/vojoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e2828a-a11b-4c05-895a-5f7d59a81549/can_i_upgrade_my_adt_system.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_58422c75cceb45e6a4567c1558f25f03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/079c8d61-7729-4a62-96f5-7c47212d6a09/36881651604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f5016d-1e8c-4646-8deb-52e989a96bcf/nekisoladunojidazabemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723fdb09-b25c-489a-bccf-d8c1acdde687/why_does_my_twitch_prime_sub_not_work.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/como_fazer_um_convite_de_aniversrio_digital.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_off0000d284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD284 5444 bytes
SHA-256: bc58c3e8f857b915d9a8033c3775b7eb059477efb39f6e905d18de8b3f046676
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10024 bytes
SHA-256: 7de5ba2ebeb1aead223d8cec876f3ad9efc750697ea17e165a33235aabaeb36a