Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e405b955a53f749…

MALICIOUS

PDF

77.3 KB Created: 2021-03-28 09:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af43ae9bd03f15339a928123ace185a9 SHA-1: 271844fc6ec988b13dee2cdd84b724b495e05b30 SHA-256: 3e405b955a53f7495a04e4e8968f9854428e1767e3faa0fcf984e51c13e769df
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as PDF documents, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to harmful 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://nipisod.ru/123?utm_term=job+cover+letter+pdf
    • https://beborojefep.weebly.com/uploads/1/3/0/7/130739591/zugulufis_nulanatuvuko.pdf
    • http://wogavuxemadirof.iblogger.org/fajolupujew.pdf
    • https://cdn.sqhk.co/falupuvevore/QK9Daij/6677358933.pdf
    • https://cdn.sqhk.co/ragekasa/b8cypif/75713733504.pdf
    • https://makojinoguj.weebly.com/uploads/1/3/1/4/131406607/4b82570860ea1b1.pdf
    • https://cdn.sqhk.co/baxilutifi/wwjgjdB/server_info_minecraft_premium_apk.pdf
    • https://gigumozogewa.weebly.com/uploads/1/3/4/5/134597084/8662341.pdf
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/4343928.pdf
    • https://lesikikonojen.weebly.com/uploads/1/3/0/7/130740189/lesunupebefozuwepa.pdf
    • https://resupomaxoraga.weebly.com/uploads/1/3/4/9/134901230/zoviguk_duwonerito_gitoburako_divewadi.pdf
    • https://natapoja.weebly.com/uploads/1/3/0/8/130813782/6f3efaa.pdf
    • https://cdn.sqhk.co/kitijorawul/bDX7hiT/49585523652.pdf
    • http://gukovukub.22web.org/3608091880.pdf
    • https://cdn.sqhk.co/keviwebewuta/gkG9Phc/dulowovewowepenubag.pdf
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/mulezibadaweti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fofeparulofiz.rf.gd/does_mami_have_an_accent_in_spanish.pdf
    • https://uploads.strikinglycdn.com/files/414f4bdb-1615-4cf5-9945-4c9242853e23/97606503801.pdf
    • https://uploads.strikinglycdn.com/files/65f014a1-94f8-4d08-af6b-ff02c4bc1416/how_to_turn_off_filtrete_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/6e8d45cd-24bf-48ba-b8ca-afa5cac57d82/breckwell_pellet_stove_p23fs.pdf
    • https://uploads.strikinglycdn.com/files/7e373b7b-a7a7-4140-b02d-0a8bbcc79d5e/79221532712.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_off0000f44a.bin
481f02f23f0d9cb5d8b7ebf60f8207c0ea17c9db7eae122202c5adf32614f31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 4952 bytes
font_01_sfnt_off0001053b.bin
0cf49066ae9df0fed1479a6570f2d64563c6422f23b31501b8441517d17f1aa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10072 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.