Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbe6c4a750ab5aa…

MALICIOUS

PDF

77.0 KB Created: 2021-05-31 20:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a75b409330a23de2d1334de8d09a589f SHA-1: 2f79d5adcf98d7ac933cb2c9f165cc6b8c4a8ce3 SHA-256: bbbe6c4a750ab5aa51fbf60bfd795de5d820fe81619ac56346f992edc5731742
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The 'Fake CAPTCHA' heuristic indicates the document is designed to deceive users into performing an action, likely to visit a malicious URL or download a payload. The presence of embedded URLs and the link farm structure strongly suggest a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://nomylo.ru/pbw?utm_term=pinch+hitter+3+unblocked+games PDF link annotation
    • https://xemexetizepe.weebly.com/uploads/1/3/6/0/136094173/8415646.pdfIn PDF document text
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/1119462.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/gedejaku_bixoxatemusib.pdfIn PDF document text
    • https://woxolifufoku.weebly.com/uploads/1/3/4/2/134234665/bd12fc38.pdfIn PDF document text
    • https://lubikumak.weebly.com/uploads/1/3/1/4/131453733/3980594.pdfIn PDF document text
    • https://zanorima.weebly.com/uploads/1/3/4/6/134624551/8e927.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/gawunisanomokajef.pdfIn PDF document text
    • https://jilowenuvugema.weebly.com/uploads/1/3/4/8/134897306/3832062.pdfIn PDF document text
    • https://wiselulusitafe.weebly.com/uploads/1/3/4/8/134892864/papifabofo_bawexadokoteg.pdfIn PDF document text
    • https://jemodenot.weebly.com/uploads/1/3/4/5/134528334/83596c590eab6.pdfIn PDF document text
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/jekurukevo.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/risukofonigakim.pdfIn PDF document text
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/fbc4de16.pdfIn PDF document text
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/savez.pdfIn PDF document text
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/22b7d.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/e0ead6d6-8457-4e03-8967-88bda69a3ef8/23927236223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/097dae31-a21e-48f1-a0d7-66d6a9c1fc1e/what_are_the_pros_of_selective_breeding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f434ab3-c60d-4b9e-9567-713cd7d567fb/hayward_pool_heater_error_message_if.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7bdb05-1eb5-4b51-b4c2-91e9d5152dca/whats_a_good_name_for_a_male_horse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84404200-f3fb-4dbd-9476-411b7a59eaba/how_can_i_tell_if_someone_blocked_me_on_discord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39bca40-8b63-44d8-bf93-4cb42958f049/20792681245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e20b31-1d68-4609-a43f-77096acab6c8/pogekopowupunob.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_off0000ea0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5724 bytes
SHA-256: e69cd02941bf70924e046740c77dc3f3b775f1c83a95ec6d9158c9cd5452407f
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11648 bytes
SHA-256: 66b5a40e6c69c1413e4072d760baca6b8ec65568f6155563607d11be66488bbb

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