Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c739c169c95937a…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 02:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 35eb635295c5386bd0c812ef6a6a447f SHA-1: 41cd6c9beb9d117b089f310726091f5d54c7fce8 SHA-256: 7c739c169c95937ab2c65997bad6f0a1429a246de4313d23e9170fb8b24d695c
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to potentially malicious websites, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary URL, 'https://bologen.ru/wix?keyword=yu+gi+oh+duel+links+pc+hack+2019', suggests a phishing or scam attempt related to game hacks. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/wix?keyword=yu+gi+oh+duel+links+pc+hack+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471512/normal_6044e1a44045d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415334/normal_5fd148bacaf3d.pdfIn PDF document text
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/8824573.pdfIn PDF document text
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/7405728.pdfIn PDF document text
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/taxejorimikodage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fcf9ea815caa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447107/normal_60031fbf42f94.pdfIn PDF document text
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/c0c7b640.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/b6b43025-3a7c-491f-92b0-cad59d1dd852/what_establishes_a_relationship_between_two_quantities_in_the_table.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/71474969543.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/71902837175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff41b34-92e7-4d7c-aa46-552c8d43009c/dolls_house_furniture_1_12_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d0ac90-4e9a-4744-8e32-ae2a3cec861b/how_many_pages_are_in_keeper_of_the_lost_cities_book_5.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_07f0c39552a744279ec3825b14f79f52.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/iso_27032_cyber_security_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bd464af-0264-498d-826b-c186329df731/house_of_leaves_ending_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdca235-db23-431d-a098-3a62d6c4cb7e/2008263979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f72b8a9d-4e36-4857-bdd4-be773f566ac2/mubexerosopebun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/319d0356-7f65-4d2e-baf5-8dbbce92d551/wenemituzefanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37760833-d5e3-4676-977b-2656ee191fe7/ashton_woods_houston.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_60ea20bcf56c43b58b693084cd4ad9d7.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_8a0599f43ed841ee9ccc54da1b8df661.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/98808726073.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/ranonapifonawenuxifuzaf.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5744 bytes
SHA-256: e5171d216a9904af570a87d159208a99c46d4c071f3cd5a45067e483a3b1056a
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 10960 bytes
SHA-256: 150594813990915e1d57e35260b35f9f19d1ea165b1499c37c6cf94e0dd17466

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