Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7f0a3747f0d0cc…

MALICIOUS

PDF

127.3 KB Created: 2021-03-06 02:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 08c7e5f5c3337de14c9714137f9b6c14 SHA-1: 8624740ecefed728aace0ceda606ab1b138b6fe4 SHA-256: 0f7f0a3747f0d0cc7b634f1ca893b615471f68a3fc1759a8d58cc74f2c86f61c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=the+main+sources+of+atmospheric+carbon+dioxide PDF link annotation
    • http://makamar.tech/digital_fundamentals_floyd_11th_edit4uxem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474192/normal_5fded7a0526f2.pdfIn PDF document text
    • http://onenature.space/segmentacion_de_mercado_philip_kotleeqcvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_6042c390da6e2.pdfIn PDF document text
    • http://mkuu.club/manualidades_de_navidad_con_platos_de_cartonq3ojv.pdfIn PDF document text
    • http://plsale.pro/tenovujoxazurebukibidau5hzs.pdfIn PDF document text
    • https://siravexadobema.weebly.com/uploads/1/3/4/3/134320718/memaxosulito.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/2682094.pdfIn PDF document text
    • http://yesstore.pro/dolowolijuvixe093en.pdfIn PDF document text
    • http://iuts.space/inanlmaz_rmcek_adam_indir92tnc.pdfIn PDF document text
    • https://kigatuxusim.weebly.com/uploads/1/3/5/3/135305206/zopora-wipew-bazeneb.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/6c0b4601-0a9e-4761-b4b9-d55abf3df6d5/hamilton_beach_4_slice_toaster_oven_-_stainless_steel_31401.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_8f843f603b5046b4b3d09462e699d489.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/28c556af-6c04-4f06-aadb-82df1740a65d/what_was_the_governments_termination_policy_apex.pdfIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_17cab0a471f542e0a98da0a46f23428f.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
    • 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_off00019e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E44 5520 bytes
SHA-256: 341cc73ce4903ce4de089b3caba1116fb485ce2f4446ce9e05501f95d20cf65e
font_01_sfnt_off0001b0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0D5 12260 bytes
SHA-256: 6a13103fa73c54521547f0fd97eb7ed9084909b1e265ac8b89a1c0cb2c6d98c4
font_02_sfnt_off0001d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9CF 16216 bytes
SHA-256: 2a266169106fd8ee7fddf72d10b696c7fa5fc4b0907400af244bd3ec84acb5df

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