Malicious PDF — malware analysis report

Static analysis result for SHA-256 8955b0eb5537b91c…

MALICIOUS

PDF

74.1 KB Created: 2021-03-31 18:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 082c4727186713ce8eae1f10a4460887 SHA-1: 20fa2074b77ac6a23a698346bada4819e4074a92 SHA-256: 8955b0eb5537b91c0383f8ffeed1b34dff3110a071f0bc071caef430dfc2dde0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

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://xajibur.ru/strik?utm_term=how+to+check+my+golf+cart+charger PDF link annotation
    • https://cdn.sqhk.co/vatukaso/jcphdhh/57547316483.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/ropelubetiwevejubar.pdfIn PDF document text
    • http://tk-time.site/ghost_hunt_anime_online_streamingjy3gc.pdfIn PDF document text
    • http://instapriz365.site/358447482869oh8u.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcf2223e83ca.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/breville_juice_fountain_cold_juicer.pdfIn PDF document text
    • http://toxipoxekej.medianewsonline.com/tojoxixokasigazulakufip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_603a2163c6825.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5feafd8a96296.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/gKaieG3/tales_rush_latest_mod_apk.pdfIn PDF document text
    • http://cheatyou.site/alcohol_distillation_process_videom8qai.pdfIn PDF document text
    • http://clebohets.xyz/38689190224qvdpr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493916/normal_6054010390212.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/introduction_to_analytical_chemistry_lecture_notes.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/what_is_the_standard_color_sequence_of_a_straight-through_cable.pdfIn PDF document text
    • http://bigops.fun/shopsmith_bandsaw_blade_lengthjcu5b.pdfIn PDF document text
    • https://cdn.sqhk.co/bodovukig/Fhfjchb/funny_hunting_wife_memes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozuketitara.onlinewebshop.net/passport_renewal_form_bd.pdfIn PDF document text
    • http://livirava.atwebpages.com/78814951149.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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5336 bytes
SHA-256: 589296e218effa3f6c8954136b530fcb29d5a26caa379efc6e63f99782069cc8
font_01_sfnt_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 10676 bytes
SHA-256: 307285afd5e1c12c14fb63be7a94dfbfadc062a30c5ddff82de9668f092b14e3

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