Malicious PDF — malware analysis report

Static analysis result for SHA-256 473c94ca12a35f0e…

MALICIOUS

PDF

63.8 KB Created: 2021-06-12 18:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90a229e29d99d59e3d907b10d4ee9cf8 SHA-1: 4cbe4a9807054a33095f9e62b7588ace19562115 SHA-256: 473c94ca12a35f0efe1e4cd25f5d2ecdfd644b536683bfe144f4b1eb2054dd58
124 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one prominent URL leading to a link farm. This suggests a phishing or social engineering attack, likely distributed as an attachment. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic identifying a link farm on disposable hosting support the conclusion that this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9357

Heuristics 4

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pixomot.ru/pbw?utm_term=objective+anaesthesia+review+5th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4369487/normal_605e042b0b038.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_604cb37091eb3.pdf
    • https://static.s123-cdn-static.com/uploads/4407057/normal_5fed68c362aea.pdf
    • https://sejukato.weebly.com/uploads/1/3/4/0/134018084/0f8e43cfaab.pdf
    • https://cdn-cms.f-static.net/uploads/4463526/normal_5fd88fc67b79b.pdf
    • https://cdn-cms.f-static.net/uploads/4388158/normal_602be8f8e0740.pdf
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/deduxananela-redifijagozu-tovuromo.pdf
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60472678ef824.pdf
    • https://static.s123-cdn-static.com/uploads/4409396/normal_5fdf9d5a4055c.pdf
    • https://cdn-cms.f-static.net/uploads/4421207/normal_60645b1e81f62.pdf
    • https://static.s123-cdn-static.com/uploads/4408188/normal_5fe2f8a84b13e.pdf
    • https://static.s123-cdn-static.com/uploads/4414173/normal_600276820b5c7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nilanom.pbworks.com/f/how_to_turn_on_keyboard_light_on_hp_elitebook_840_g4.pdf
    • http://zosajivapesi.pbworks.com/w/file/fetch/144672090/97006228427.pdf
    • http://fenetikuro.pbworks.com/f/pumesewuxawodav.pdf
    • http://rujuboxu.pbworks.com/f/vuxasawutafidivezul.pdf
    • http://molitutolu.pbworks.com/f/rifiwimutuxodibamitov.pdf
    • http://jabevexizoj.pbworks.com/w/file/fetch/144724056/curso_adestramento_de_ces.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/145074924/jugelixepidelawigumazabag.pdf
    • http://xujefix.pbworks.com/w/file/fetch/144422943/free_robux_redeem_card_codes_2021.pdf
    • http://wuwazilizos.pbworks.com/f/9th_maths_book_back_answers.pdf
    • http://vawijoj.pbworks.com/w/file/fetch/144462492/tabla_de_bit_byte_kilobyte_megabyte.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceba.bin
730d693b22b355c8f67f0add308488155f165b29cc920b1e2adcc45556803998		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 5728 bytes
font_01_sfnt_off0000e24e.bin
cf061ef5c61ddb9bcab3254ad39362db847910f92027d07221fb66b1d8a3e6b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 10076 bytes

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