Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b8b6875066c685…

MALICIOUS

PDF

81.1 KB Created: 2021-05-07 22:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1c8b179060c056542dc1e6ef7e0664cf SHA-1: 7742f44dad6a35665019df5d8daacfc60ac538e4 SHA-256: 86b8b6875066c685172d13acb6e09e302fae6f8f2f00335d97c778cdb28c4aa0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a movie title, suggesting a lure. The presence of external URIs, particularly 'https://lozipotod.ru/strik' and 'https://somubafe.weebly.com/uploads/1/3/4/4/134444697/8291979.pdf', strongly suggests these are involved in the distribution or hosting of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://lozipotod.ru/strik?utm_term=el+conde+de+montecristo+gerard+depardieu+espa%25C3%25B1ol+pelicula+completa PDF link annotation
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/8291979.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/kesowilabefudezener.pdfIn PDF document text
    • https://kepemumud.weebly.com/uploads/1/3/1/4/131454984/6534510.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/business_communication_essentials_5th_edition_free_download.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/6655758.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_5d70ce14e34148dcaa4c405f8923e7d8.pdf?index=trueIn PDF document text
    • http://muwuvago.atwebpages.com/boveduraxorunefalal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98f2f7ff-dd4c-4657-a8ee-29195094731e/how_to_get_atem_software_control.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/marejoludiguvawafot.pdfIn PDF document text
    • http://fojakosi.atwebpages.com/53662680313.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_afe7d1d757af424d8e90304c21bbf341.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada59fea-e655-4a93-8efb-29795638567c/53957372729.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/dusasid.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_36929c6ce274487bb07c6d906a0129b7.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_a85d1e4d22e94ff58d4934ff0def92f4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/13484038480.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_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 5564 bytes
SHA-256: 42f40bf2555f65bee8adeb2ee43170a55b494b105a41218f26e03ed944834669
font_01_sfnt_off00010cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC8 12456 bytes
SHA-256: 33a53234ca18bd73b5e1836638b39291d759ac7874ae1ad18dfea8c3676e5ead

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