Malicious PDF — malware analysis report

Static analysis result for SHA-256 2557b89fb7015b5a…

MALICIOUS

PDF

79.5 KB Created: 2021-03-02 21:46:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b4692702bc344d6087298d93dff717f8 SHA-1: ba8e39e696c627f3aa44102de746ecc9753bd827 SHA-256: 2557b89fb7015b5acfda142acbbf567fad369adba51df4dda6846ffc2f344a9c
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a malicious document, including a high ML classification score and ClamAV detection as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are changes to payment or banking instructions, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://golowaki.ru/wix?keyword=genesis+v2900+manual PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/ih4hijc/81862508841.pdfIn PDF document text
    • https://cdn.sqhk.co/folukize/cig4ehh/80120483613.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/shjchhb/susov.pdfIn PDF document text
    • https://cdn.sqhk.co/savimatuv/dsQajd2/equalizer_fx_apk_download_uptodown.pdfIn PDF document text
    • http://melotedi.iblogger.org/korugezuvezowijafewa.pdfIn PDF document text
    • http://sojurufo.iblogger.org/hp_pavilion_dv6_bluetooth_driver_windows_8.1.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/6198110.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/KjigiYA/adventure_ball_free_download_full_version.pdfIn PDF document text
    • http://fiwojinafo.22web.org/which_country_provides_the_most_foreign_aid.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/mevobegawivitotosut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebimanapedupun.epizy.com/counter_strike_1._6_online_play_free.pdfIn PDF document text
    • http://fuvituze.epizy.com/algorithmic_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/guided_access_iphone_can_t_unlock.pdfIn PDF document text
    • http://wirugon.epizy.com/notification_icon_png_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/47544296624.pdfIn PDF document text
    • http://topazavagujefit.epizy.com/cuentos_mitologia_griega_para_nios.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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 5256 bytes
SHA-256: 440375b3a749d749a51c5e430278c7d2e229dfbe73554456bebdda96c8d81acf
font_01_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 10344 bytes
SHA-256: 831df7a2e7f514794a502343f89cf0a4272f8b4e2a283f5ff253f3eca0072508

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