Malicious PDF — malware analysis report

Static analysis result for SHA-256 6201f54e05b5fa53…

MALICIOUS

PDF

75.1 KB Created: 2021-04-12 08:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2225ac46a75ba787915eb8498ae1a6af SHA-1: 79c908db365faa16892bd70e66e9499c6999945f SHA-256: 6201f54e05b5fa530b56fed49fc05aa86f14aa841d46dabe0e186ebcca9fb3b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful content.

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://dafemum.ru/strik?utm_term=freddy+krueger+jump+rope+song+lyrics
    • https://cdn.sqhk.co/bebumila/p5vCE9S/calling_software_for_laptop_free.pdf
    • https://cdn.sqhk.co/josipinu/gdjdhcT/cloudcal_calendar_agenda_planner_organizer_to_download_music.pdf
    • https://cdn.sqhk.co/gibuzini/CksiiE0/vofikibapivoxebasolofus.pdf
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/6e224b09.pdf
    • https://jivoxixipilekok.weebly.com/uploads/1/3/4/8/134885045/5703512.pdf
    • https://cdn.sqhk.co/lituxopevuk/jdhcjfK/29018403665.pdf
    • https://cdn.sqhk.co/sovokeduseb/eEgiRie/59105747719.pdf
    • https://cdn.sqhk.co/pasojixaju/Hii9hic/lozokimamilosajokes.pdf
    • https://cdn.sqhk.co/xurajalijok/giniawN/70599559870.pdf
    • http://sesosorav.iblogger.org/network_cabling_standards.pdf
    • https://dajoromu.weebly.com/uploads/1/3/4/3/134309711/a4b9e26ce1.pdf
    • https://cdn.sqhk.co/raxipopu/h7jaibq/boy_bmx_bike_18_inch_wheels.pdf
    • https://cdn.sqhk.co/denepepunuja/ibbifjh/xerenavoxamobikowo.pdf
    • https://cdn.sqhk.co/roratumopiv/iaoEFhh/nekokisafujiju.pdf
    • https://cdn.sqhk.co/widobixi/idhhdjf/87076267084.pdf
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/7931178.pdf
    • https://xekigumi.weebly.com/uploads/1/3/0/7/130776031/semizogak.pdf
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/furagisanasejep-lapisitunik-dafawuzini-mijuda.pdf
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/4158882.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safamulidapi.epizy.com/what_is_the_reason_for_advanced_sunrise_and_delayed_sunset_class_10.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_off0000e7b8.bin
40a4bdf1796b84bc900ca51ec6b5076a28d73379a57df122c7e9712f39c2d658		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B8 5380 bytes
font_01_sfnt_off0000fa0c.bin
dc5573d8d71435959f69cbda7a2a497b4f8d0a8283d882e445cda8f87922e62e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 10952 bytes

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