Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbac5b3d9b5de7a9…

MALICIOUS

PDF

84.2 KB Created: 2021-05-25 07:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4fb8316004eebcdb80efd55d4fb9da68 SHA-1: e90546519f5e09fbcf3046ad49051f38b02236bb SHA-256: fbac5b3d9b5de7a9f2393ef59e08a779916b3fdb0e9d9e7730e7100f6a9edfde
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=do+black+and+tan+coonhounds+make+good+pets PDF link annotation
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/4086647.pdfIn PDF document text
    • https://lazekikobetilof.weebly.com/uploads/1/3/4/4/134443651/xunulaze.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/jomimasaw.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/2740519.pdfIn PDF document text
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/02085976.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/b05374e1d.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/375b9614b4.pdfIn PDF document text
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/22d9a7d.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/mevobegawivitotosut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5e8309a9-8ac9-4db6-a703-7212d272d335/shadow_monk_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/now_or_never_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3acaed-824b-4356-976a-f2608108db6e/05_pathfinder_overheating_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/254a9f84-47a8-40ea-b22b-a458de0eed0f/91038373030.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/best_african_american_history_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/85493907530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c663ca06-1008-41df-9f39-b77ae943b88b/how_much_does_a_mile_of_road_cost_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bede7578-da19-4db8-8654-12dc5ddb339d/is_postage_a_fixed_or_variable_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1cb0c4-8f18-4a54-a49c-83948780dbab/kaplan_free_online_sat_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/62568784587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfe3e8a-5d5d-4be7-b21f-4ce2b146bfa7/10601090407.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/arch_linux_for_virtualbox.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/tuwibetuzeforawemewixej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 5428 bytes
SHA-256: 887fe0ca9abc62890f3703581b14b972fb4f250625aaa25eb54154593934a8f0
font_01_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 10148 bytes
SHA-256: cf274d26bfad1cda300997a3534c10899fed75642be6b32454544b46b10652fe
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3