Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25f9f51eac07fbc…

MALICIOUS

PDF

77.2 KB Created: 2021-03-16 04:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 267c77aa2bbf66e24b3b19157deb7967 SHA-1: d249b680fd3593c8d097a5106fe6c5b27b79c6a8 SHA-256: e25f9f51eac07fbc5571938a19304b48e581a72accd2265f074ab2ba6f50d795
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, many pointing to PDFs with numeric slugs, suggests a link farm or SEO manipulation tactic. The embedded URLs likely serve as a lure to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=airborne+fungal+diseases+pdf
    • https://cdn.sqhk.co/nuvexajamu/hMwroid/35513337305.pdf
    • https://cdn.sqhk.co/palezubifo/ghhdihn/zetezujonapami.pdf
    • https://cdn.sqhk.co/ruxuvedije/3GKhgje/90228075477.pdf
    • http://republvinb.fun/zikawopagepaxifuriw1byhb.pdf
    • http://top-salez.site/163135858old7d.pdf
    • https://cdn.sqhk.co/nopusixinid/LW6ibd5/fagarogatatoferox.pdf
    • http://mnclassis.org/420753312554xvjq.pdf
    • https://cdn.sqhk.co/gojinuma/fjcgejb/tosigim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74016bec-7e5c-4414-bf06-7841ec85d7fd/navy_officer_designator_insignia.pdf
    • https://uploads.strikinglycdn.com/files/21595f13-e7eb-4e3c-b058-3291908fdf83/every_young_mans_battle_dvd.pdf
    • https://0443db59-9f9d-4031-b786-8a5723798135.filesusr.com/ugd/ab62d6_6b0d92fa68484cecb0a6761abd5d3183.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4aa54c4a-7764-49db-9888-2b2273f94b16/how_to_service_ge_washing_machine.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_1788f616cc2445dba032f0c27f4d51fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/318cac51-83b1-4d42-83d6-0505824b7269/eventide_h9_harmonizer_vs_max.pdf
    • https://s3.amazonaws.com/rolefosiju/how_to_reset_a_gas_valve.pdf
    • https://uploads.strikinglycdn.com/files/8a1ae98b-5669-420a-b024-3a19fda4d417/acer_laptop_keyboard_not_typing_letters.pdf
    • https://s3.amazonaws.com/gogunabones/zorilofemasozakomi.pdf
    • https://uploads.strikinglycdn.com/files/d4f9d77b-4bdf-4dc4-b638-40e1abce054c/where_is_wps_button_on_linksys_ea6350.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcd.bin
c82b49d89ad1f1b392180337494fc9810de18f22407e10793ea055a2e00d2fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCD 5336 bytes
font_01_sfnt_off00010205.bin
81c70c8a508cc7e23d43b3c3d1551763d6f9a85090775df5a99f8bb1c1455fe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 11164 bytes

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