Malicious PDF — malware analysis report

Static analysis result for SHA-256 539bd355220e5966…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 09:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d6979e4d3da0ea69252e57aa3a08bf24 SHA-1: 25cf9e02f35efca6d151ea6603fb744a4c973d9f SHA-256: 539bd355220e59667bb8894ee6f09652bf0087e33544f84114591b9ada3aa3f2
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://midufefew.ru/123?utm_term=background+photos+for+photoshop PDF link annotation
    • http://poopo.ru/lowrance_hds-5x_fishfinder_manualzp4a1.pdfIn PDF document text
    • http://girlita.space/does_college_baseball_play_7_or_9_inningsvm63n.pdfIn PDF document text
    • http://copyrightsupport-ig.com/funinaloduviletopezexm41tb.pdfIn PDF document text
    • http://weinmvc.net/391604977570rpbe.pdfIn PDF document text
    • http://giftcard-sale.store/2012_impala_ltz_oil_capacityhv3o8.pdfIn PDF document text
    • http://xabusiwidurej.22web.org/wamawidijefaxel.pdfIn PDF document text
    • http://lumurezekosarew.66ghz.com/2014_jeep_grand_cherokee_srt_oil_change_reset.pdfIn PDF document text
    • http://gelixovuxa.22web.org/brother_mfc_7860dw_toner_office_depot.pdfIn PDF document text
    • http://hangookoil.ru/harbingers_last_survival_best_characterslrcdq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_fea8b8adcb8b416195825a8c3de9b24c.pdf?index=trueIn PDF document text
    • http://nugifola.rf.gd/17484514065.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/tokefo.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/bejeweled_3_full_version.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_d99fea9107864739b1a47f296a72b548.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afe6917-4e00-4e6b-bb67-7fd6fb1029c4/what_is_the_stanza_of_a_poem.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_982c536ca57442908820f1b5d06f0cc1.pdf?index=trueIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_dd2fbff359dd4f42aa86e4103881d2d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/rezasativiluwanagevi.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_a1c1b38cf86f48dea309bbb0f79373d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ad3ba9-51a8-4a0f-8cc6-92b9a6f7a6fc/graco_4ever_dlx_4_in_1_car_seat_safety_rating.pdfIn PDF document text
    • http://lifinevedilubu.epizy.com/lafejuluvuser.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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5500 bytes
SHA-256: 3470035715ec36989a66fa143a342d43b7ac2c94b3a9a98df46ad1e388d2517d
font_01_sfnt_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 10460 bytes
SHA-256: b517bf5f949b76a7960e0e8198fd16ac2202aaeafb41c92a32be594ca49f5127

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