Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5c0210b3d93cef…

MALICIOUS

PDF

76.8 KB Created: 2021-02-27 21:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7abaae81277d3173a111c4f37613a442 SHA-1: c902814cb1afe86461c404e08d18a0e647345be3 SHA-256: 9d5c0210b3d93cef4547346ed80ead1c2b14e1a510509793c5e28699b422d1c1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/aws?utm_term=casio+protrek+pathfinder+pag240 PDF link annotation
    • https://cdn.sqhk.co/xopuwatipo/9niekvE/29433127031.pdfIn PDF document text
    • http://nout-prodat.site/ethiopian_geez_numbers09yf8.pdfIn PDF document text
    • http://differencecheats.net/81573023728rsgv8.pdfIn PDF document text
    • http://tesar-krd.ru/535501582618dqk8.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/43_best_movie_storyboard_examples.pdfIn PDF document text
    • http://fruktovik.com/fumutifigj9uv1.pdfIn PDF document text
    • http://tapabafana.22web.org/ruvujiduxuw.pdfIn PDF document text
    • http://itanah.space/milliken_publishing_company_mp4041_answersb8wh5.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/zebiwojizi.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/fhginfW/copenhagen_grooming_beard_growth_kit_reviews.pdfIn PDF document text
    • http://wipunemobak.mygamesonline.org/how_common_is_obesity_in_australia.pdfIn PDF document text
    • http://airned.ru/casos_practicos_de_marketing_mix_resueltosro6eq.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/webizokoma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/83817082988.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 5600 bytes
SHA-256: f5c6c3630d027198cf22172bf36a13a6925a2a09b28f61df6241a80c0140e8d7
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 11104 bytes
SHA-256: e52e5f3fb7dbdb86b363c2f99b0eda530f83afdbdc296c6242b34daddeb00bec

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