Malicious PDF — malware analysis report

Static analysis result for SHA-256 af94ffc1ebc75784…

MALICIOUS

PDF

70.5 KB Created: 2021-03-23 16:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21dcc7fe30d7d4d06f1ff5f7465df3da SHA-1: 3b2925e91498816509db5434312d49b8fbea33b6 SHA-256: af94ffc1ebc75784e138bcbb5a16d83ac4ba9daf6213920c5d147cce5e48e02c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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://kuzutuzo.ru/award?keyword=business+intelligence+strategy+and+big+data+analytics+pdf
    • https://cdn.sqhk.co/pawapoma/djisKhc/30699891298.pdf
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/c910d.pdf
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/ronewigukapesa-xizef-suxujiki-giwufaka.pdf
    • https://cdn-cms.f-static.net/uploads/4462352/normal_601212e08a611.pdf
    • https://cdn-cms.f-static.net/uploads/4465924/normal_603cbac878c55.pdf
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/koliguzomonamo-tavuped.pdf
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/wiwanevenekiv.pdf
    • https://cdn-cms.f-static.net/uploads/4466657/normal_60558cbcc5a59.pdf
    • http://inostrana.com/mta_bus_routes_queens_new_yorkdzc4g.pdf
    • https://cdn.sqhk.co/kofisosiz/gjqicgc/vegetable_chopper_amazon_canada.pdf
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/dozevo.pdf
    • http://italywow.pro/sole_f80_treadmill_for_saledyoq9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonabafat/belkin_n450_db_factory_reset.pdf
    • http://kapudezab.rf.gd/subetitijunaxesunibukoleg.pdf
    • https://s3.amazonaws.com/gazivemon/report_stolen_passport_card.pdf
    • https://s3.amazonaws.com/patilawasu/bazogusowelumuvusivomudij.pdf
    • https://s3.amazonaws.com/jolozidabi/what_transmission_does_husqvarna_use.pdf
    • http://tidomag.epizy.com/27050544946.pdf
    • https://s3.amazonaws.com/limewub/ankle_sprain_physical_therapy.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_off0000d36d.bin
0121dbb5419a811cdec03938c130249790bb06142171aea6c4b3f56aa28c6c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 5612 bytes
font_01_sfnt_off0000e69e.bin
174aca9f426316fc1adce9f282b908a74331f87fc37d96b28324bc86af4b421d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 10952 bytes

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