Malicious PDF — malware analysis report

Static analysis result for SHA-256 352205f034bb45c9…

MALICIOUS

PDF

86.8 KB Created: 2021-04-05 18:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d4a71185fbe0580d8c3ec85c81e2afff SHA-1: 23a10b23655acb3a7d777635f97ac0ad90ef7217 SHA-256: 352205f034bb45c98e9e5e2a22f87730b87b8bdea41e9f50b2b14a85724aa375
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. One prominent external URI, 'https://zajinet.ru/award?keyword=aula+ingles+iniciante+pdf', is likely the primary lure, masquerading as an English learning resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/award?keyword=aula+ingles+iniciante+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470545/normal_600cfe178bf45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388040/normal_600aaf3067a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_602251c9c50bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_6050ec29a1914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_a9a3b23dcad9405fa0a0de56c9dc2345.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3099ee0-8e43-48fd-8017-07e46b7a9dff/haldol_davis.pdfIn PDF document text
    • http://nuwewime.rf.gd/devi_bhagavata_in_gujarati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce513409-c52c-44fd-8673-a1b926f074d1/legiginuvise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1118b5-44ae-4760-8e28-78b2636c9933/25751679975.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/dazobagug.pdfIn PDF document text
    • http://pubamawuxa.epizy.com/marantz_portable_cassette_recorder_pmd_430.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/divegowoda.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_d3637ef1d13d436cbb2668194cabf180.pdf?index=trueIn PDF document text
    • http://deroxemonak.epizy.com/how_to_write_a_case_report_neurology.pdfIn PDF document text
    • http://zalipimotumotim.rf.gd/how_to_make_mac_screen_smaller_again.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/sociologia_urbana.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_52aa43610b674346ad33c135d3ed5c3c.pdf?index=trueIn PDF document text
    • http://tugefewose.rf.gd/30265041859.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_1abcbb6a1daa41feb077e370dd8636d7.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_cd84843c480447d4a21d13f44936817a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7f88bd-7bb5-417c-9a76-c7073082d875/3694193683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e0ce79-20a9-43ef-bcaa-9c799f371e1a/the_great_gatsby_chapter_2_study_guide_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 5216 bytes
SHA-256: c39ebc57edee4f5bd8dd4f6136dbcbe1b7b187921f9eecf7abb74b1fffb2f575
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 2052 bytes
SHA-256: bfc0904f0f0d07b2dad5b874710802535660feb5301dd45df0a8c923e4b19bcb
font_02_sfnt_off00010d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D88 13376 bytes
SHA-256: 47798c3d1a5d41c69a82fb917120206981f2c4b1e94e760e41a973d5019449a1
font_03_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 16660 bytes
SHA-256: 451a97a76e1cd188b335db18aa59b090969584b10ed985ec5dcca0b5cdb1d7ae

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