Malicious PDF — malware analysis report

Static analysis result for SHA-256 807a324d1bbcbdd5…

MALICIOUS

PDF

83.1 KB Created: 2021-03-09 10:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 616442962abf3612e6c5e6e1ce6a0c10 SHA-1: fcba24c7421fe4346ace8cc0873bd1a7cb2b3408 SHA-256: 807a324d1bbcbdd5905d782257dc8a08713d878c10fb161a4186a65a1705e9d2
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://baarspo.ru/strik?utm_term=bach+cello+suite+1+prelude+sheet+music+violin, is presented as a search result, likely to deceive users into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/strik?utm_term=bach+cello+suite+1+prelude+sheet+music+violin PDF link annotation
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/6524342.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/Ehf3Fhj/95641200382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600cf76271442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fd082c6131c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464871/normal_602548d394de7.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/9823374.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/aSjihf0/defuse_joker_gas_bombs_fortnite.pdfIn PDF document text
    • https://sasopezanureje.weebly.com/uploads/1/3/4/6/134691995/d4003eabd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_60414f7bdd196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447434/normal_5fe27604e91fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_6041cdcc0f98e.pdfIn PDF document text
    • https://waxaveroguwako.weebly.com/uploads/1/3/5/3/135344917/fazuzure-ratezex-nulek.pdfIn PDF document text
    • https://peziwavadeba.weebly.com/uploads/1/3/4/3/134313506/7984211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_60200b1a615ab.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/gbiaMif/posamufofuvojafubigivis.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/ee720ffb-4062-4bcd-a27a-c4ac6bbe6d90/best_oil_filled_radiator_for_large_rooms.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_42e0113978d14688a5023982da2ddc42.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_bba5d65901a04945a5a2d849ef5ffc36.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_51046daac6ca4a5b8b1a849a19bb070a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60262a1e-1d02-456d-8edc-741166b68e81/pijavujiwizober.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_ae25af8e056244efa8717eefc18c7efb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25093141-2153-493f-873f-329968562f3d/gesonu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 5472 bytes
SHA-256: 1bb56413996d3b43db6136c43291680d211df112604572f2bf4e783888a4d484
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 12908 bytes
SHA-256: 2c74cf1d078fa063c660a2493eec91a493da836f872ee59ab74020e337c1371a
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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