Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24f7ab97ac3bedc…

MALICIOUS

PDF

91.9 KB Created: 2021-03-20 16:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9dc11707b58ebff3a97c6bbc1b9ab149 SHA-1: 72110effa7c8f49e5f584008832759e7f39a4010 SHA-256: c24f7ab97ac3bedc6508f8a9e9298f246c5e952f223c980c2ffd246b33695a4d
186 Risk Score

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-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://lozipotod.ru/strik?utm_term=charlie+and+the+chocolate+factory+cast+national+tour PDF link annotation
    • https://cdn.sqhk.co/dubibuwa/NKiaImr/digi_unlimited_high_speed_internet_rm8.pdfIn PDF document text
    • http://dubiniba.iblogger.org/55108059999.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/ggXidje/4113042695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff87c8b5-ca28-4ac0-94ba-218234037d87.filesusr.com/ugd/1d4e4f_39c8e0407df74667b93eefebf42102bf.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_21cadd35aefd4940b8135efbc5a06159.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_b0c2e2d029b14386a4356324dcf231dd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazovugal/45657783267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0f56513-5a01-4471-9645-782759749aca/53224693998.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_4458953c857941709b61cce000a1e776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/bending_ply_sheets.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_af122302e9de40779ff17c595ae3c530.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/auxin_adventitious_root_formation.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_f17772bfc9f941ff8c875e9fba0b2b10.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_8f5d3a63d1554541940fb6eb1b535a1d.pdf?index=trueIn PDF document text
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_3f737745a5b544c4bd546270801af13e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17747d4d-c6a0-4790-aa99-e0f50cf6cba2/is_there_going_to_be_american_assassin_2.pdfIn PDF document text
    • http://rinudesit.epizy.com/xoruzojajizepuwizazulawof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f229732f-3c84-4574-b9b0-12aeb35231e2/blue_point_eecr1a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0523862-f861-4530-827a-c12baa77fda9/50973718818.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_off00012907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12907 5116 bytes
SHA-256: f23d4102a6a12a19de4fc66075c3aef2c2127d098d54131898e2360c198916a1
font_01_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 11512 bytes
SHA-256: 9cfa1752362c1a878d8c1db032c3e8ea926c5d6a0cf486394acc78908ac6d01e