Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ca1e74eb000b7f…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 09:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd976fe6f2f5e3d86fe881866cb99699 SHA-1: 7ffc6b410fe4980ed3605a843751f67eebaf54be SHA-256: 54ca1e74eb000b7f1a0bc8b72dcce62c9c6b3912327f2f8675e78fea85c9b43b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The primary malicious URL identified is zajinet.ru, which is likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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/strik?utm_term=el+se%25C3%25B1or+de+las+moscas+resumen+personajes PDF link annotation
    • https://waseralubireg.weebly.com/uploads/1/3/4/6/134622629/sesof.pdfIn PDF document text
    • https://tawajuwu.weebly.com/uploads/1/3/4/8/134850210/lidap.pdfIn PDF document text
    • https://zidadosivifaju.weebly.com/uploads/1/3/0/7/130775619/jozububujerovadit.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/gotelinesusip.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/lowuwuxoloz.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/4448531.pdfIn PDF document text
    • https://pewovejike.weebly.com/uploads/1/3/5/3/135319851/wonepupobujedab.pdfIn PDF document text
    • http://mujojodisi.22web.org/acta_constitutiva_de_una_sociedad_anonima_mexicana.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/mepuja_telafav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/94467882834.pdfIn PDF document text
    • http://nogogesusuwebob.epizy.com/7470058846.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/yprac_vertigo_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/chhaila_bihari_bol_bam_song.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/16194288785.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/is_sodastream_bad_for_your_teeth.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_a374d0ffad8f4f3dbb90ae657cd39c7d.pdf?index=trueIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_944aedbfc8774d9eb572203c3302d839.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/58502375290.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/backgammon_rules_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/fixasezuxixapifupejena.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/ajay_devgan_movie_dilwale_mp4.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_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 5464 bytes
SHA-256: a1deefd360e8616cc1babac305df7fcff97c7a72c70d536aa1612495c953c795
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 11500 bytes
SHA-256: 981b432e595e21450b6b7d51e3229ad03ab94b5464e35eec350ee6a6e981d6ae

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