Malicious PDF — malware analysis report

Static analysis result for SHA-256 f334a08dc1b479fa…

MALICIOUS

PDF

99.5 KB Created: 2021-04-27 16:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f00e2c8d43a151fee47ef53e28d93395 SHA-1: 5e55eda267b96657cba078c8b46109778aae05fc SHA-256: f334a08dc1b479fa1c528182b40256c38b2889a0fe10d8d13fe428bde4bdeb6a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=good+workout+plan+to+gain+muscle+mass PDF link annotation
    • http://slimerecipe.org/dupevifafigowifoxizoxelsb4hw.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/xejelabemowuxenukizebab.pdfIn PDF document text
    • http://vazamewugox.22web.org/2010_chrysler_town_and_country_transmission_fluid_chart.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/xivato.pdfIn PDF document text
    • http://biolinkus.me/80824325703bmi33.pdfIn PDF document text
    • http://kopavavabigi.66ghz.com/73602808584.pdfIn PDF document text
    • http://1s.london/alebrijes_dibujos_para_colorear0nx7u.pdfIn PDF document text
    • http://verifiedbadges-form.com/naxotobigalujekunida2u0ix.pdfIn PDF document text
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/mepugobe.pdfIn PDF document text
    • http://itravelgr.com/13341989767qdpke.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/logerixazo.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/70019939909.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/levorabibugatojaguz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_948ee1ccbccf428a85ff5a5847b8b50d.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_16d219472b27445dbc96f8e64dfc4380.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_0381f579c91d43da9bcecd009c900f44.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_841a504420354a23be0db7628301659c.pdf?index=trueIn PDF document text
    • http://gudinomid.rf.gd/76325647738.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_45b0916310d94ac48743c395312a628c.pdf?index=trueIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_fd528959b76f4f49b995582c86aca4c8.pdf?index=trueIn PDF document text
    • http://juxugalipexobow.epizy.com/writing_a_simple_cv_template.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_252b5a11f94a430caaeb7a586a362378.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_3b290bf153cd41e6a576a90571647f9b.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14908 5580 bytes
SHA-256: 61b7170843991a73a9069bb530d4682b375834f9f4a6ebaf844d6f4768464ab5
font_01_sfnt_off00015c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C07 10688 bytes
SHA-256: 41b3f7c903feda6db401aea88a0c4c6a7b792c48bf9e9b35c9d60c58e5413bf7