Malicious PDF — malware analysis report

Static analysis result for SHA-256 d954aa1e8a287845…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 00:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c3e9e9bcbfe8bfec75a7df3929f94279 SHA-1: f66a3769c581f263a65e246456b7d564939ef021 SHA-256: d954aa1e8a287845179d954ff689175572b2690ed9456f513a8281680276b9eb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, https://maypoin.ru/strik?utm_term=conceptos+basicos+de+las+artes+plasticas, appears to be a redirector. The document body, though heavily obfuscated, contains metadata related to its creation, which does not directly indicate malicious activity but is consistent with a document designed to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/strik?utm_term=conceptos+basicos+de+las+artes+plasticas PDF link annotation
    • http://kufigada.22web.org/42800375312.pdfIn PDF document text
    • http://tepafuvofes.iblogger.org/26640499578.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/agenesie_du_corps_calleux.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/what_is_new_in_iso_9001_version_2015_standard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jukasuxoseki.atwebpages.com/direct_causes_of_deforestation.pdfIn PDF document text
    • http://jabafujadopus.rf.gd/their_eyes_were_watching_god_chapter_10-13_summary.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_ebe5ff0f50d642098709ac440bc7ba0f.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_4cc91ec76ca348708fb306ce0f13ec73.pdf?index=trueIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_943a182162da46e3914e75f384231787.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_663524f8ab374e5c9254c458fad5bdc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd1c78c-60cb-4539-92e2-1a67e0977a71/jazz_drum_beats.pdfIn PDF document text
    • http://kilunebanuj.epizy.com/18911244270.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/dietary_guidelines_for_renal_failure.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/vajezerifum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7736799-aed0-43af-90a7-e224042fd290/zowimatat.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_5b6f4a1c16a34c88967b93ba2f8c0d0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/desenaz/rowdy_baby_video_song_free_masstamilan.pdfIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_df26c17262a24bd3a7526f2f72ee054d.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_cb20cc2aee7a44828173d42c22631cc4.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_010c198201a44d92a3d9cae2df4e9559.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakadutof/michel_foucault_the_history_of_sexuality.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/xuwutenokebelatoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c66df3-50cb-4f1f-be84-2573108ac2e5/handy_stitch_sewing_machine_amazon.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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 5112 bytes
SHA-256: bc5d3259cea2b3daf5fa83ff3eeca041c848559eb256d9ec225a200897f78f30
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 12428 bytes
SHA-256: 6b11a41eb4b52267ec533ae5c43d5c3ad33122150eec1813bc08785be1ee43e4

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