Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f79c3f803c95017…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 10:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e0e9d6f152fa811f22a56679b6f0b3ed SHA-1: 7cd6d12c32caff568b86cb60e6bfe9d47e874f3e SHA-256: 6f79c3f803c95017c429e41e5b4ff1a1bbbd9cd386dbc149ea5e8de403f72a86
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The presence of the 'utm_term' parameter in one of the URLs suggests tracking for marketing or malicious campaigns. While no scripts were explicitly extracted, the heuristic firings strongly suggest the PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution.

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://jacksth.ru/strik?utm_term=natural+gas+pipe+installers+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426549/normal_60624ccf193d3.pdfIn PDF document text
    • http://originalhallyu.com/agile_vs_scrumslzra.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/domumakopavigukosoja.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/4912800.pdfIn PDF document text
    • https://pozimifekof.weebly.com/uploads/1/3/4/6/134674510/c3caa284a67789.pdfIn PDF document text
    • http://clientbluebadge.com/528772202305chru.pdfIn PDF document text
    • https://tatudikugox.weebly.com/uploads/1/3/4/7/134738012/gulusotesatapaturaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5fff556e34c33.pdfIn PDF document text
    • http://xumukekuvag.22web.org/atualizar_hora_automaticamente_android.pdfIn PDF document text
    • https://niliwuwez.weebly.com/uploads/1/3/4/2/134265541/masumikitebale.pdfIn PDF document text
    • https://sumejuloluguwir.weebly.com/uploads/1/3/5/3/135390827/bexuvaro_jilirifago.pdfIn PDF document text
    • https://nagewapebikex.weebly.com/uploads/1/3/4/6/134647925/zeritajiteniju.pdfIn PDF document text
    • http://future-techno.ru/7930952737ad44e.pdfIn PDF document text
    • https://sumokexopusoval.weebly.com/uploads/1/3/1/3/131378975/besamevegi_tekumewa_susokavamiku.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://keepmaxi.space/fuvopukebuxufafurozogumu2gecu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe8e4029dddf.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://s3.amazonaws.com/gurafoga/28153342662.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/brothers_in_arms_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/ps4_ejecting_disc_on_its_own_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/xawijexixeni.pdfIn PDF document text
    • http://kobizesamow.rf.gd/tvs_bolt_torque_chart.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_off0000f1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 4880 bytes
SHA-256: a50b779e4a738278f9229c2bfca21481fdd941306ab628375da6dfb915fa6fdb
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 9888 bytes
SHA-256: b70a3c2f131969d432dec9c60396688e696b6efc9ed50b46cf4453022126a07e
font_02_sfnt_off0001242b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3