Malicious PDF — malware analysis report

Static analysis result for SHA-256 0943acebb894db67…

MALICIOUS

PDF

85.4 KB Created: 2021-03-12 18:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 65e4e19a7493101804bce86dce676115 SHA-1: c6c1c64de421c515d7363e7e84ecb21f50a7c9b5 SHA-256: 0943acebb894db67aaa156f91fd48e82fdea4a258c31c8f95a4b0b7c77f2caad
186 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to performance appraisal examples, directing users to suspicious URLs like https://xezojetit.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/strik?utm_term=what+to+write+in+my+performance+appraisal+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420917/normal_601629b3ec7a1.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/the_culture_map_chapter_6_summary.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/how_to_carb_cycle_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475562/normal_600e7ad795c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_602f43bac5158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_60127d4447ed1.pdfIn PDF document text
    • http://life-news.tech/weather_report_bilaspur_yamunanagard1xzq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_60176f39c977a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376874/normal_603e89cb9efa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369162/normal_5fefc1e9debb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fe6624737083.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/gravity_boots_increase_height0i0ry.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/sedoda.pdfIn PDF document text
    • http://ukrinsure.com/556726340752mu7z.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/ludosujup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60197da4245b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455681/normal_60269d9b53e7f.pdfIn PDF document text
    • http://prizinsta24.online/95995754425t6ikz.pdfIn PDF document text
    • http://waystep.site/como_eliminar_las_tarjetas_de_credito_en_amazonb1cej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/maxalezadasukodefepiruru.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/brain_teasers_puzzles_worksheets.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_1993ef28bf6748c187c522428cd6de61.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_55c8cc0b33764dc3813592881fb67f88.pdf?index=trueIn PDF document text
    • http://zikoliduxa.atwebpages.com/effective_c_book.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_2ab16ef3759d43d79360f03880756d38.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_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 5320 bytes
SHA-256: a494f4926504fab6dece4fc6d52e3d79435376cde9487b13aaf8a9ba66faa5ce
font_01_sfnt_off00011548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11548 10664 bytes
SHA-256: 7ef8539c27ce8e17deeec5b8d0d27caa4ecfdf26b3be5e9e260ff63762aa62d4
font_02_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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