Malicious PDF — malware analysis report

Static analysis result for SHA-256 babf4d59201bfdfd…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 22:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a8c2ce53ff4cb8005628d3af0ab08efb SHA-1: 0bf873da616f67b17f5498fdc6640ca4e69792b9 SHA-256: babf4d59201bfdfdfa71621ff41505fd7c025ea1c206e336bff2ac10836313ec
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://vilenefex.ru/strik?utm_term=three+most+interesting+things+about+me.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=three+most+interesting+things+about+me PDF link annotation
    • https://tunupufimudodo.weebly.com/uploads/1/3/4/3/134324073/ragapuwalex-xofanod.pdfIn PDF document text
    • http://avit0.cc/how_to_reset_my_culligan_water_softener7rkb6.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/nifowin_jomipoxijeja.pdfIn PDF document text
    • http://help-copyrighteamservice.com/how_to_edit_a_photo_using_paintsx694.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/106417.pdfIn PDF document text
    • http://gnoogle.site/suvujazopudaml3ujx.pdfIn PDF document text
    • https://wawodedirikib.weebly.com/uploads/1/3/5/3/135348651/zesidizeforo_rebemoxuf_xawitoxowaxaga.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/7485798.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/2358267.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/3a51af5a-f8df-4037-a32a-2eebfa24a10a/70293057901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4296c39-a90c-4920-bf5e-dab9224a0e96/is_dyson_having_black_friday_sales.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/arizona_cardinals_injury_report_week_5.pdfIn PDF document text
    • http://kabofed.rf.gd/score_a_film_music_documentary.pdfIn PDF document text
    • http://xasidesarilune.epizy.com/12627154929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81074b-9440-461b-bddf-234dba2b8627/2020_goal_sheet_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8960c278-17e6-4dbc-8987-5acfa6bfa36c/wajinugutujuwepotimowomiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51957975-4c88-4a52-b913-32c373c6b6d8/19745924174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785b1d44-bcf5-4354-900f-60dd6c55f01a/gutadevu.pdfIn PDF document text
    • http://gabigirinekib.rf.gd/ratijeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067c8c6d-67e2-46ca-980b-769eb6255974/lanotezawawuwakuvuf.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_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 5156 bytes
SHA-256: c17f4af1c09f3f0baf5b750ebf816bd7afc73dd02f7eeb8b415f49bc6bd465b8
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 11004 bytes
SHA-256: 54baf10bb96df3701faed69080fbbd9461b215c4c229aba8471e9c66c57cbddb