Malicious PDF — malware analysis report

Static analysis result for SHA-256 3482e024b0d9a55a…

MALICIOUS

PDF

74.2 KB Created: 2021-03-05 17:12:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b44e985649d1bcbc4fc1379417024af4 SHA-1: d8468d38687496ede140aad2be0db51e204c57bf SHA-256: 3482e024b0d9a55a964bfa2de10b4550226350d114255138080f56a74badca28
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. One of the extracted URLs, 'https://bologen.ru/strik?utm_term=law+books+online+order', appears to be part of this lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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://bologen.ru/strik?utm_term=law+books+online+order PDF link annotation
    • http://esclub.info/rorokitqkjlu.pdfIn PDF document text
    • http://pop-marketplace.ru/how_to_clean_a_kohler_tubyojz8.pdfIn PDF document text
    • http://maleev.online/verizon_wireless_mifi_monthly_plansnxxn2.pdfIn PDF document text
    • http://amst-watch-v1.club/kegujogokuzegofavibutufhqul.pdfIn PDF document text
    • http://buyfastedcircle.xyz/demasisowetewirapu3fyd1.pdfIn PDF document text
    • http://snapchat-alert.com/setusepugapadunekaliwuokaeu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/car_beep_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/ketarokatax.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_567ed129104844a3b49b6852675ad68a.pdf?index=trueIn PDF document text
    • http://bumufemukelogik.epizy.com/5069975617.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/xugupepenenaza.pdfIn PDF document text
    • http://vobujubiga.epizy.com/tuneruke.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/miperularokale.pdfIn PDF document text
    • http://noporotosodapo.epizy.com/conair_handheld_garment_steamer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/el_mundo_de_sofia_pelicula_resumen_corto.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_ad553b1bfc1344cea9efea1cbb88d9f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/93952042716.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/bollywood_all_song_mr_jatt.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/gikowepuxosupuxiv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 5056 bytes
SHA-256: de6194cea0b118edef0acd051abac18313f5239c2b45120362938bbf687b32c6
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10648 bytes
SHA-256: 81ed97d24d287eb97a9bf42e4da269cd5963d2417929fcf60c8a18ecd41d4c9e

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