Malicious PDF — malware analysis report

Static analysis result for SHA-256 3628b9e29f9208ab…

MALICIOUS

PDF

81.6 KB Created: 2021-03-15 15:32:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b55e8f138fd5b9c51b85c523a5b7b519 SHA-1: d4d8fbb0ca223c4e60b443dc8503304bb1c2610b SHA-256: 3628b9e29f9208ab973ac09bef22588532937cca25b0ea888c5cfc79cde61b51
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or redirect the user. The primary attack pattern involves directing users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gimoguvi.ru/wix?keyword=euphonium+vs+baritone+pictures PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fddbd9ca2346.pdfIn PDF document text
    • https://cdn.sqhk.co/mareduviger/erdsHif/nitupipofokirofaxima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6035893ad8d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_5fe80ccdaa5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60170cc2dcee0.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/giNgiTP/penalty_kick_percentage_premier_league.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/fmgjXhf/ice_cream_cone_mcdonalds_price_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_602db35143c47.pdfIn PDF document text
    • https://cdn.sqhk.co/nawikerumipa/cMgdiiA/kits_de_dream_league_soccer_2020_juventus.pdfIn PDF document text
    • http://bepibolet.22web.org/murottal_surah_an_naba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_62a98730e2044a36850cfbe914158b3e.pdf?index=trueIn PDF document text
    • http://kakapefetabol.rf.gd/gcse_history_revision_guide_medicine_through_time.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_7335b3c95fba43dabba82c87ae7580d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/29442598393.pdfIn PDF document text
    • http://pefebamiw.rf.gd/77013794716.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_9242daeda4ed4c6682631cff3806f3df.pdf?index=trueIn PDF document text
    • http://zifejurujudeku.epizy.com/rariximobajadamarakaka.pdfIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_5e51c31df4da4fde9f6ced049a564494.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_64cd2f0d2b614dcc870589cef1c7e3f0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/kufofonelirejesodaz.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/ragewam.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/ferejujujubaruwivedusez.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/which_is_the_best_model_of_omron_bp_monitor.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_14570dc5b9304da399e01b1e8474d217.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_83fa02c73c0a4ed49152de01b08b0f94.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_f9e99405c2804c3b8edf66e8735fba1e.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_c569eb8617c04f38ac4da7f12fe2c88b.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_664a6a75777e4d9ca48c1cdd45c4b2ef.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 3368 bytes
SHA-256: 23450e29ffa6de749f5b39ee0ae6c5603990389015c7cefdb02a8ee0426fca2d
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5296 bytes
SHA-256: b88f01f517eda91b7ead5a382d8652d8a32b8805cb6375c29923d5d4eb5dd5e3
font_02_sfnt_off000110f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F4 11620 bytes
SHA-256: b245328be7bb0f2cc52010bc19f9cec54c5ae4d55676a84616d194100824cda3