Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf16617f2014abcd…

MALICIOUS

PDF

89.7 KB Created: 2021-03-28 18:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce2d31e4c48cc3e423cbf4a9258fb68a SHA-1: 7c990c0dfa70a39b6355a95eb67677bfe6debd1f SHA-256: cf16617f2014abcd085075b6d6e6015149c91d33a72df1a4f5d0d1420cfe55a3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning or phishing, with one heuristic specifically identifying a large link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is used to facilitate the malicious redirection.

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://resalured.ru/award?keyword=cours+chimie+atomistique+pdf
    • http://gudutisiluzew.mypressonline.com/5882610825.pdf
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fe6b29ede136.pdf
    • http://jonotijero.medianewsonline.com/dracula_audiobook_tim_curry_free.pdf
    • https://guxenebulofoto.weebly.com/uploads/1/3/2/8/132814975/zukakujid_bepuva_batenidav.pdf
    • http://sawemawe.mywebcommunity.org/55209725426.pdf
    • https://cdn-cms.f-static.net/uploads/4487201/normal_60605841c1dec.pdf
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/08954ec27a90b1.pdf
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/nevowalupixujufun.pdf
    • http://vonoxafaku.scienceontheweb.net/business_process_reengineering_free_ebook.pdf
    • https://nibolujadi.weebly.com/uploads/1/3/1/3/131381302/zebaxopoloda.pdf
    • https://ramowukegi.weebly.com/uploads/1/3/4/5/134508735/reliruwunol.pdf
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/8590186.pdf
    • https://cdn-cms.f-static.net/uploads/4417998/normal_603186b30b06c.pdf
    • https://cdn-cms.f-static.net/uploads/4426261/normal_6058e70765907.pdf
    • https://cdn-cms.f-static.net/uploads/4481988/normal_6020bc67b8b9f.pdf
    • https://cdn-cms.f-static.net/uploads/4472763/normal_603f1975efe0c.pdf
    • https://cdn-cms.f-static.net/uploads/4387925/normal_5fd9ea818eb47.pdf
    • https://static.s123-cdn-static.com/uploads/4471250/normal_5fed60db18642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://supuwevul.atwebpages.com/surah_al_mulk_urdu_translation_only.pdf
    • https://uploads.strikinglycdn.com/files/1f7303a1-93f3-46e8-ba35-2403ff498f57/frigidaire_gallery_bottom_freezer_ice_maker_not_working.pdf
    • https://uploads.strikinglycdn.com/files/2b275a8a-33e8-4e01-88c5-fc732a0ffd76/el_poder_de_la_oracion_en_la_biblia_catolica.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_off000116e6.bin
2c04f694a495754903933f27f560be7d2e2efae6b1d0b5c9b309b93e176cfd3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E6 5392 bytes
font_01_sfnt_off0001290a.bin
7dce4c1e616fe07c0b6e21505c77e7a9e03a11c9a2206f1897b59f9d445a5f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 14940 bytes

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