Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87d51bc4194b910…

MALICIOUS

PDF

81.9 KB Created: 2021-05-22 19:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6ba77adf65fcc4d3799adfc05177eaa3 SHA-1: c8844bb3017bdebbdfcedce42eb5daee24c13f06 SHA-256: d87d51bc4194b91083953694807a254b19c6cf893d68b38ce78dcd720b24ae6a
196 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be a link to download 'counter strike source no steam', which is likely a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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://druttle.ru/strik?utm_term=como+descargar+counter+strike+source+no+steam+para+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6058da1c7e7a8.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/adele_someone_like_you_chords_easy_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_60526b346f0c4.pdfIn PDF document text
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/rajazomokasu-kemumogapaf-perifimigebudi-porekeroge.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/chennai_express_movie_in_hd_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/definicion_de_organismos_coliformes_totales.pdfIn PDF document text
    • https://sokijolixorinus.weebly.com/uploads/1/3/1/1/131163896/tedonavejarosus_xipakabutetuliw_lozujudasage_bajugozosojat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5ffb7490e64f7.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/disney_princess_coloring_sheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/98023469582.pdfIn PDF document text
    • https://sukutunog.weebly.com/uploads/1/3/5/3/135304197/buzejotuzifuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1f9213-1150-4bef-93d3-1ad3dba9c9f5/return_of_the_king_castle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd994415-396f-41fb-8c4b-04d113e5b79a/mawoxexel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf2f4d8-db9e-4a60-9f94-5497bf583a89/tascam_414_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9898841a-cf0a-4b8b-a338-afd99ec8dc1a/kisaxuzupuraxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/252fce16-1179-464d-bb59-e71bb77cc5b7/the_man_in_the_high_castle_season_5_ending.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 3312 bytes
SHA-256: c831c0099bffbf94db1c9580b4cb35a0384fd9e709a536bff0a7677d877bee30
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 5332 bytes
SHA-256: d2a3c49c3c0b2798b404009f8aa723ec26883938163877276d9b9b8f58b4ecc5
font_02_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 12040 bytes
SHA-256: 0f324f38cf53c75a951ea6e67579172381b46027e40204d4d15f733520022adf
font_03_sfnt_off0001227c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16120 bytes
SHA-256: 2a726e4d8e078a4a4a6a0bed67b139344cab8167eb027720faf42c08020076b2