Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cde3a6e136017d5…

MALICIOUS

PDF

109.3 KB Created: 2021-02-26 07:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad5977c4c44d45bab8919ba737f4b9b5 SHA-1: 8d99f6e54e3d58d408c0744b16da1128997438c0 SHA-256: 4cde3a6e136017d52e58cecd2f3f0bd86e7050ee07d33d53f22a721beae26f0e
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, including one pointing to 'bologen.ru', suggesting a phishing or malware distribution attempt. The presence of embedded links and the nature of the heuristics indicate it is designed to redirect users to potentially harmful external sites.

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://bologen.ru/strik?utm_term=%25D0%25BE%25D0%25B3%25D0%25B3%25D0%25B8+%25D0%25B8+%25D0%25BA%25D1%2583%25D0%25BA%25D0%25B0%25D1%2580%25D0%25B0%25D1%2587%25D0%25B8+1+%25D1%2581%25D0%25B5%25D0%25B7%25D0%25BE%25D0%25BD+3+%25D1%2581%25D0%25B5%25D1%2580%25D0%25B8%25D1%258F PDF link annotation
    • https://cdn.sqhk.co/ruvajuvewuj/cnhiS60/business_administration_accounting_degree.pdfIn PDF document text
    • https://cdn.sqhk.co/xujutitula/j0jaGC8/loop_recorder_implant_cpt.pdfIn PDF document text
    • http://porn77.design/90608165571s4q73.pdfIn PDF document text
    • http://lozavisimas.22web.org/nalc_contract_raises.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/jhjja0v/dogegumisu.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/blfsjbe/global_citizenship_meaning_in_tagalog.pdfIn PDF document text
    • http://ekzo-fruit.ru/how_to_speed_up_software_development_process7akdw.pdfIn PDF document text
    • http://servempieza.site/badoo_verification_photo_bypassfb8ff.pdfIn PDF document text
    • http://chatik85939775.fun/kanejisoxozuzosozixinixarq0f4w.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/gjqjjjh/anki_cozmo_power_cube_battery.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lofese/zotinoguz.pdfIn PDF document text
    • http://xurorovesi.epizy.com/jejelovava.pdfIn PDF document text
    • http://vixabediwudofi.epizy.com/35479400674.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/49248014736.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/nidapujexifimunade.pdfIn PDF document text
    • http://wiwifiladovov.epizy.com/bugokusofunijolefemivexa.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/kerunaganomamorapawusalo.pdfIn PDF document text
    • http://roworozirad.epizy.com/76677200948.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000172c8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x172C8 29340 bytes
SHA-256: dcf19d431ff99d33d524fae4df67f1d21ce11ad8be413ec3e42b3db5421db32b
font_00_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 5800 bytes
SHA-256: 0b48ff88f2e1ac020b2ef7a7159077d2489e2426bf6567f6f92c911b4868091b
font_01_sfnt_off00014072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 16236 bytes
SHA-256: 299323c3c26d085801c584b4d8fc4e93a1067f078c0a1d5ecc6391f9a2b023ac

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