Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d42a5ba1ca051…

MALICIOUS

PDF

95.4 KB Created: 2021-05-25 00:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d5599797b4765cf4b35596cdfbfe83a SHA-1: d42232eca9ea2f7cd9f0ec123d7f14c3cb9c0daa SHA-256: 809d42a5ba1ca05175b9833caf130b1ea00695b5eed545082fb0ac8c4284e078
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn-cms.f-static.net/uploads/4457582/normal_6012973f9be7b.pdf
    • https://cdn-cms.f-static.net/uploads/4499942/normal_601f2a54dc1ae.pdf
    • https://fodolazaso.weebly.com/uploads/1/3/4/8/134891373/lirobamadegu.pdf
    • https://cdn-cms.f-static.net/uploads/4419198/normal_600e6a5389baf.pdf
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/kukijupif_lebabobudag.pdf
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5fe3f5ec3ed1f.pdf
    • https://cdn-cms.f-static.net/uploads/4420470/normal_6054c46e211f4.pdf
    • https://cdn-cms.f-static.net/uploads/4367668/normal_606e9c3eb0025.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_6054953bd96f5.pdf
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/nulitiwaluj-tovudiwetudijij-wekeden-xubifosifeb.pdf
    • https://cdn-cms.f-static.net/uploads/4369519/normal_60208f4a84cce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=bsf%20questions%20and%20answers%20lesson%201
    • https://s3.amazonaws.com/jotizifime/87946392332.pdf
    • https://uploads.strikinglycdn.com/files/0b3c2a59-3048-4ef1-89fe-691b2fc67d77/pengertian_jaringan_lan_local_area_network_adalah.pdf
    • https://s3.amazonaws.com/jefazaxal/british_school_in_cairo_uniform.pdf
    • https://uploads.strikinglycdn.com/files/0d4b7f96-6cd0-4f73-a337-5dacf991a597/gibomazijo.pdf
    • https://s3.amazonaws.com/julaxel/93074156055.pdf
    • https://uploads.strikinglycdn.com/files/80b944b0-360b-4624-99ef-a23776cc062f/aimpoint_pro_patrol_rifle_optic_1x30mm_red_dot_sight.pdf
    • https://uploads.strikinglycdn.com/files/69c8b8fb-c5a1-478c-8d69-4b2bf6f4c693/asus_rt-ac66u_change_password.pdf
    • https://s3.amazonaws.com/vebogotexaf/32602741714.pdf
    • https://uploads.strikinglycdn.com/files/7e963060-7ad9-4bb9-bcae-fe5e895f86f3/56511571926.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011715.bin
fc25c67ff94e1daf4e849a17d989cf8ada75414ec6b6172cd0235ef992565499
pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 8984 bytes
font_01_sfnt_off00013554.bin
4c692f4e0d603f948b76f408c22bd8f252dd46b87ddf7a2a52bd9f45615c57e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 5220 bytes
font_02_sfnt_off00014739.bin
8d9b31509e40c56167dcbe868462006f086631df3d5b0bd9e913ba75f7b18201
pdf-font-stream PDF embedded font (sfnt) at offset 0x14739 12036 bytes