Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a304dbdcc19814a…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 18:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9ed9e152438edf3e0f57e4617bc66a03 SHA-1: 8b68627a6b4e12331283eb394dcd3d5e8ddbf212 SHA-256: 2a304dbdcc19814a8d21ef9942992f99018356d40d3754b2b2e8a084aeddb13b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. ClamAV detection and ML classification strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URIs points towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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
  • 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://lozipotod.ru/award?keyword=where+to+donate+clothes+to+veterans PDF link annotation
    • https://cdn.sqhk.co/lajojeletab/cALDgjx/stickman_army_the_defenders_hacked_games.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/ajjKwhe/jixojiwunekilawigi.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/dhihigd/difoseruzuxomegovif.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/lexozafazawibupalito.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvepelela/ejbhebE/cool_motorcycle_wallpapers.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/jugafebomezolowaniwuk.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/9156754.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/46470319093.pdfIn PDF document text
    • http://lady-bug.club/can_you_trade_penny_stocks_in_australia0bfj2.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/car_air_conditioner_stop_leak.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/agFjcha/puwelejimiwuvemowifejowe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_60249ab23e535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limulusukad.rf.gd/xiniremu.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/honda_rebel_250_weight_limit.pdfIn PDF document text
    • http://sotatelovutegep.epizy.com/affairscloud_weekly_february_2019.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_off0000eee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE4 5100 bytes
SHA-256: 0c3e78a19ea377b5f968c82c3a0340b17b986c5255c5299014426de9e91baf21
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 10868 bytes
SHA-256: 8e36741409910c8349c92e7099b0410a517d7f4f0d56a635759fe9f977d76234

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