Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a35ae463611ea71…

MALICIOUS

PDF

75.2 KB Created: 2021-04-29 13:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9cdeee8da2f6bca74a35fc4b492aac9 SHA-1: 9992d452a50a9c0031d4bef957587e21a0997286 SHA-256: 4a35ae463611ea71cd139b71e0aa0df31558536bfb9ca67a2377e3837ed9dae3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain (resalured.ru) that is likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=the+militia+act+of+1792+did+what
    • http://smartcoin.design/what_time_is_stock_market21wwk.pdf
    • https://cdn.sqhk.co/dutigimomana/gfiiC6G/kerumewewediriruto.pdf
    • http://onsideball.info/94943500218z21zi.pdf
    • https://cdn.sqhk.co/tinipuded/jjUgeic/58885158638.pdf
    • http://azakalaza5.xyz/asm_handbook_volume_2are8c6.pdf
    • http://goodnatural.space/1812475272932s3r.pdf
    • https://cdn.sqhk.co/jusitufugaf/gtW0pgf/monkey_puppet_looking_away_meme_template.pdf
    • http://bio-ita.fun/what_is_enthalpy_change_of_atomisationgjvyi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2f06586b-0b35-4106-a725-2592c3c14bd3/what_is_taxi_driver_in_spanish.pdf
    • http://rawuvotatu.rf.gd/forma_ideale_bastenske_garniture_i_cene.pdf
    • http://tipixerokofor.epizy.com/calamity_devourer_of_gods_guide.pdf
    • https://s3.amazonaws.com/kelageketisefuv/ar_15_pistol_556_vs_9mm.pdf
    • https://s3.amazonaws.com/jezobasit/piezo_vibration_sensor_datasheet.pdf
    • https://s3.amazonaws.com/dukavunivifa/14562328727.pdf
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_1972058221cd40b4b6272ea524cb2a93.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58b94a77-18cd-4321-9736-b93a8a922c2e/dugimawovipa.pdf
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_55db2249bfa34193bd1011fd79cd79bf.pdf?index=true
    • https://s3.amazonaws.com/mujesogi/update_personal_details_form_template.pdf
    • https://s3.amazonaws.com/garorowa/foluruxasutejulaxelulosat.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_off0000e783.bin
d134812a32a059db4c4a85c5d059c21f7c597756945c18914467c687caeaf458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 5448 bytes
font_01_sfnt_off0000fa0c.bin
bb2e35e1c9b503921c8ecf3ab6174071e9502d0b3558a1813e1d793330ef3ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 10612 bytes

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