Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b26b2060e64785f…

MALICIOUS

PDF

68.4 KB Created: 2021-01-24 11:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 89c93f497c8e68345e916464350100ac SHA-1: 25f96c9fccad7bfeb59094ed42378673ac6a5fec SHA-256: 3b26b2060e64785fe480a73344f2e621ad9e43475a1a66e63bbb2ef67e539e4e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed for redirection. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is intended to trick users into believing there are new or changed banking instructions, a common tactic in business email compromise attacks. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF, likely exploiting PDF vulnerabilities to redirect users to malicious 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://maypoin.ru/aws?utm_term=charbonneau+commission+report PDF link annotation
    • https://cdn.sqhk.co/xejudawadoni/Mjaiagg/84810706536.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/qAhbEDc/minecraft_education_edition_skins.pdfIn PDF document text
    • http://everydays.space/super_adventure_pals_2_online_game9h7yg.pdfIn PDF document text
    • http://nubolutlion.xyz/mifogoz8ciu.pdfIn PDF document text
    • http://helpforteam.com/53055342315hh3ot.pdfIn PDF document text
    • http://yazansoft.com/gisowenufizowuxirusaziupx01.pdfIn PDF document text
    • http://d-youtube.com/tasty_planet_forever_pc_download_freewezem.pdfIn PDF document text
    • http://libertinemodels.com/metal_madness_pvp_car_shooter_twisted_actionn0fi7.pdfIn PDF document text
    • http://allieshouseofhope.com/78388344601r1t3l.pdfIn PDF document text
    • http://dayzcommunity.info/best_xbox_360_headphones6rqfw.pdfIn PDF document text
    • http://akfb.online/music_and_arts_uptown_westervilled47wt.pdfIn PDF document text
    • http://jilet1.club/life_is_strange_2_episode_5_souvenirshbgg6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigilozixorod.epizy.com/explainer_video_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/wofimasidafuguxubogizuxu.pdfIn PDF document text
    • http://vogojitipam.epizy.com/burma_tv_9._6.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_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 5184 bytes
SHA-256: c68a51f9fe5d07bbec7e3905a46b3555d8c20cec6589c300ecb11ff87eaea26e
font_01_sfnt_off0000e12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12C 10856 bytes
SHA-256: f9f8c4dd6b334ece77a8c78f50f6839231239e17fe8eadc36251345316d553d1

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