Malicious PDF — malware analysis report

Static analysis result for SHA-256 adef141a88b84406…

MALICIOUS

PDF

80.4 KB Created: 2021-02-05 04:11:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 737ae0a5c0164e96a10cc00054362481 SHA-1: 794c3e447f9eb268579b15b23cc427c24b72c0d1 SHA-256: adef141a88b844061aeb7cf4091dab37eb852b5d4aac434aed3f2687058333c1
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing attack, specifically a payment redirection lure, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. The presence of numerous external URIs, including one pointing to 'jacksth.ru', suggests an attempt to direct the user to malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing conclusion.

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jacksth.ru/123?utm_term=does+sprint+use+nano+sim+cards PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451047/normal_601b982d6dff0.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/jg9jage/wizixejebapixata.pdfIn PDF document text
    • http://konsalting.info/leadership_behavior_definitiontg6i4.pdfIn PDF document text
    • http://ujjjrrrrr.space/crazy_taxi_gamespot1i50n.pdfIn PDF document text
    • http://menformula.xyz/knife_sound_mp3_free_downloadjaa2c.pdfIn PDF document text
    • http://carishr.com/best_2v2_decks_clash_royale_202052jh2.pdfIn PDF document text
    • http://copyrightproblem.com/car_shakes_when_shifting_gears_automaticiklkv.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/bviikaL/donut_drift_hot_wheels_precio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_5fda760dd9cec.pdfIn PDF document text
    • http://formblckr1.xyz/vazikaxunedu5olpx.pdfIn PDF document text
    • http://godulonu.22web.org/boxuvaxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/qhhidcO/survive_zombie_horde_last_day_on_earth.pdfIn PDF document text
    • http://babubusawase.22web.org/cartesian_dualism_mind_body.pdfIn PDF document text
    • http://interior.estate/35416696009w4gmt.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/gg7jggg/baby_yoda_stickers_telegram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nevurewajarip.epizy.com/autocad_tutorial_for_civil_engineering.pdfIn PDF document text
    • http://girifej.epizy.com/oracle_configure_to_order_process_guide.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_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 5184 bytes
SHA-256: 31057c6744e4051298550e33cd489a639158ca35b26dc7e30e1963a8655c2d80
font_01_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 11300 bytes
SHA-256: be5d7e3716ea62797932012e0dc97342df97733a8af3ba15ec0b6a16b2fa5a28

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