Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c06179e414e099…

MALICIOUS

PDF

65.1 KB Created: 2021-02-10 21:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c662137f4310ebff004121a9873c9c6a SHA-1: dbf6d680fa5c7a72ac5382a4a2d1bd761bf1ba0b SHA-256: 55c06179e414e09923725021cf2eb6c94bdc6a439a245bb31329811c2fc77a45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript, though not directly executable in this context, suggests an attempt to exploit PDF vulnerabilities or redirect users.

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://druttle.ru/aws?utm_term=free+perfect+attendance+certificate+pdf PDF link annotation
    • https://cdn.sqhk.co/pozedezupase/4gchfhh/28534376395.pdfIn PDF document text
    • http://bigmagazin.xyz/antivalores_de_los_ojos_de_mi_princefvhj1.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/gemK8gh/fireboy_and_watergirl_ice_temple_3.pdfIn PDF document text
    • http://bred-enligne.com/wallet_pattern_leather_free1eeec.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/S1YjfMF/wutetova.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/bwgc1hd/31118478814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_60206301b206e.pdfIn PDF document text
    • http://mainsale.info/45903109761my7o0.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/check_upload_speed_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_600bfd1b33c51.pdfIn PDF document text
    • https://cdn.sqhk.co/mupijuwo/1ijfNhc/samunufox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600fbb7c7a9f0.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovoja/BhcUhhb/hello_neighbor_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobexegedun.epizy.com/tutorial_camtasia_8.pdfIn PDF document text
    • http://terefikug.epizy.com/bullguard_antivirus_free_full_version.pdfIn PDF document text
    • http://konomubexidop.epizy.com/oh_baby_song_free.pdfIn PDF document text
    • http://vogonadebemumox.epizy.com/automobile_body_building_engineering.pdfIn PDF document text
    • http://ketugida.rf.gd/cricket_scorecard_template_ppt.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_off0000c335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 4896 bytes
SHA-256: aecaecc5eaf5d62627d8f293d5b2b26448c825b5c79c25948e502500bb312d9a
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 10436 bytes
SHA-256: 3d1454d688bbbc1d70c88dcacb07737d0589f50eadae42b3d679d97c93aec6ab

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