Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f3fbb901f32d96…

MALICIOUS

PDF

115.2 KB Created: 2021-03-31 22:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7b285f28a6fa6a43ede96ca0ec28ae94 SHA-1: 808227bebc1f6911e3aae3e841f14608ca539e7a SHA-256: 81f3fbb901f32d96886c363cb7a6480643373eea1bf62457446dd9d813c210a6
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to search terms, reinforcing the lure of finding specific information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/award?keyword=what+is+liberation+theology+pdf PDF link annotation
    • http://lukunezevowazol.sportsontheweb.net/xavelogi.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/lozam.pdfIn PDF document text
    • http://hotita.space/9452824162714urc.pdfIn PDF document text
    • http://sesobejajanasak.iblogger.org/algebra_lineal_libros.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/how_long_should_you_sleep_with_ambien5l93q.pdfIn PDF document text
    • http://familyit.info/does_my_2014_samsung_smart_tv_have_bluetoothu47vx.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/2512bbbc-b735-4135-9486-324d3279fc4b/fundamentals_of_differential_equations_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/1996_polaris_trail_boss_250_reviews.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_2f73858935dc470385f0322d686fac8f.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/xafiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e201c8b-a413-42cd-a997-fa6ffea05bc0/47656086340.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/88762647403.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_c32048fc248e4832b28e30b5dceaecc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b537862-c4b6-430c-8f65-aa4d9b7b4e1e/luvopibulupunivoveseton.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/zofenus.pdfIn PDF document text
    • http://fopopas.epizy.com/what_is_fedex_tracking_number_format.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_off000183c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C9 5556 bytes
SHA-256: 02c168c2ffccc94c0064e1ab972788b2c19800c4c2799782b75c4ba04440a017
font_01_sfnt_off000196b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B8 13548 bytes
SHA-256: 0bd2133be03970f143521e61d414397ae532bc925d6c506d71e6202f182802ec

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