Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c5a5bf15d45d9a…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 21:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 84e60d9178877c0be205c98438657663 SHA-1: c3b189d466ba7df96b63d0bc76717e9c04fbb2e0 SHA-256: 85c5a5bf15d45d9a98a6a46acd59e422ce7e79782429c03f07b72a7b49d76008
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, specifically as a phishing trojan. It uses an SEO redirector link disguised as a guide for setting up a saltwater pump to lure victims. The presence of embedded URLs and the nature of the detection suggest a phishing attempt designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+to+set+up+intex+saltwater+pump PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff6ae5a1a6ca.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/86533128858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379053/normal_5ff0358d1ef52.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/duzixabaxalamifemexobenof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_600ea31158511.pdfIn PDF document text
    • http://nout-sale.site/dakevilurexebidanenvk5x2.pdfIn PDF document text
    • http://ukrinsure.com/92994863517uzep4.pdfIn PDF document text
    • http://keepqifi.site/47660302395ldome.pdfIn PDF document text
    • http://salet.store/vikiwejusafmr75.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/Eqhgsih/kuvewuxowizovotuziv.pdfIn PDF document text
    • https://cdn.sqhk.co/zitibidino/gu23xii/gudopaxevigisojabumegem.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/56380291628.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/systems_analysis_and_design_an_object-oriented_approach_with_uml5f1m9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/romoguxamajo.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/43430816562.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/57663233890.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/tarzan_car_full_movie_mp4.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 5088 bytes
SHA-256: 73be7f491bdb26e0c8661a9cfa6181cc30d707bfb34c985f3ebd5160db95cc8a
font_01_sfnt_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 11276 bytes
SHA-256: 1987064e0ab4b9ac8b78505d3214dc59827e80ece164dad9bf9b8cdebc359194

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