Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2fb331eb45af8d…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 12:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc596554289b2e7222f9d9849d45aa0 SHA-1: 5acef27b05a73806adc4b006c9b89ca1fd192e77 SHA-256: 7a2fb331eb45af8d14813eff0afa3ca37029600bab494257f0fcace26620bf67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=sol+usi.5b+life+in+the+southern+colonies
    • https://sufusaripowo.weebly.com/uploads/1/3/1/4/131437865/zozogaxokoxoxamex.pdf
    • http://pusovemolexed.scienceontheweb.net/autocad_export_text.pdf
    • https://wafitaweligu.weebly.com/uploads/1/3/4/5/134587259/zulor_menosaluto_vukubakalave.pdf
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/b6f37cb55b092.pdf
    • https://tuminiride.weebly.com/uploads/1/3/1/6/131637714/c4434c36e99.pdf
    • https://divaruwidis.weebly.com/uploads/1/3/4/0/134042650/f9587.pdf
    • http://somixewavado.sportsontheweb.net/dna_astrology_books_in_tamil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rurebafib.onlinewebshop.net/plant_genetics_textbook.pdf
    • https://s3.amazonaws.com/rewepalazamiso/71415114165.pdf
    • https://s3.amazonaws.com/xakajoziwibi/cars_3_game_pc.pdf
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_47509c2d3a204c51b53e5f735e8f94f7.pdf?index=true
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_070259a3631b49b9b4af949329ad3509.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/19054858358.pdf
    • http://vepitejususas.atwebpages.com/zilebuvujelokawum.pdf
    • https://s3.amazonaws.com/tarajix/weber_grill_restaurant_schaumburg.pdf
    • https://s3.amazonaws.com/bejeseja/fedomuluruzomariwolodu.pdf
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_ca269aef0dd94ac98f6d4d5b40cad5db.pdf?index=true
    • https://s3.amazonaws.com/fadadedezeker/film_being_frank.pdf
    • https://s3.amazonaws.com/pilazi/2536580326.pdf
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_82542e6591f4409cb5d11f6d9b25d9d7.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/que_hace_un_mecanico_automotriz.pdf
    • http://taberadajip.atwebpages.com/dexuvezibosuk.pdf
    • https://s3.amazonaws.com/tidigudetefumof/aamir_khan_movie_dil_chahta_hai.pdf
    • https://s3.amazonaws.com/xisakazelelinim/78135891100.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010136.bin
57b5e89cfafaa86c57e90c0efe63bc49cdec20d6ff3436514ed06a58692e5151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 5156 bytes
font_01_sfnt_off000112c8.bin
9a0d762c88c451527a60a172aaffe34896ddf8e200f82511c4511dcd8252045b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 10524 bytes

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