Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a85df0d41c9ae9…

MALICIOUS

PDF

80.7 KB Created: 2021-04-05 11:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 10013ccdf22339bb29c389896277313c SHA-1: c22d642a26c4d6928bc600a3e015f456f0abe5b9 SHA-256: 07a85df0d41c9ae97ad5ca8e5425d930f92ea88ff395ffd10b3e6743e87b5329
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to exploit users seeking information, disguised as a 'machine learning tutorial powerpoint'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=machine+learning+tutorial+powerpoint PDF link annotation
    • https://lafimidoxugimu.weebly.com/uploads/1/3/4/5/134505664/nogaja.pdfIn PDF document text
    • https://tizusetupo.weebly.com/uploads/1/3/1/6/131607013/towozivefoselefu.pdfIn PDF document text
    • http://saxosoxajivovud.medianewsonline.com/faxovaviwizefupikotireri.pdfIn PDF document text
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/xejexigasupoze-fivemovijax-gesagevisivesi-doroxinikiga.pdfIn PDF document text
    • http://erogan-oficial.site/philosophy_of_social_science_research1ezw0.pdfIn PDF document text
    • http://yesstore.pro/writing_chemical_word_equations_worksheets800k.pdfIn PDF document text
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/pusajutikisakowolesu.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/introduction_to_agricultural_machinery.pdfIn PDF document text
    • https://lenonexijinex.weebly.com/uploads/1/3/4/6/134647177/f4c8f6d1ce15.pdfIn PDF document text
    • http://melomone.scienceontheweb.net/59838249921.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/sujogunajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_f5b8e5d8c52d4320a3f3f1debb0eb075.pdf?index=trueIn PDF document text
    • http://jatujij.rf.gd/software_defined_mobile_networks_sdmn.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/brazil_serie_b_table_form_and_standings.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_598fd944ca564c7b9de34227bd2ca6d4.pdf?index=trueIn PDF document text
    • http://rogidisili.rf.gd/emirates_nbd_account_opening_form.pdfIn PDF document text
    • http://xewarokulix.rf.gd/photoshop_cc_2019_brushes_free.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_34cc622feaa14831a805d7c86a2e1a0c.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_3e06f5dcd97e4a60bf0892c47114e9af.pdf?index=trueIn PDF document text
    • http://puxetedategekex.epizy.com/veweken.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_51d7425a4e5142579d1bf4de05e189d0.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_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 5116 bytes
SHA-256: 08cc30cbb04052f61c15c50cb2f078dabce7fd43b261cffd567d183813815a2e
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 10964 bytes
SHA-256: 2907701cbf0d69afab49cb695e6160eeddf7ed64d71d1b615cbed43859aa38ef