Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf42e0120d06c919…

MALICIOUS

PDF

73.0 KB Created: 2021-03-08 01:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46c0197ae34c02ff3b12ab49b63f9e4a SHA-1: ebc8b4b11ed6157de3080f8c332d63987a2b05ba SHA-256: cf42e0120d06c9199f0c05a94cdaaf00a04443b769aecb6854db2e2928a23b97
134 Risk Score

Malware Insights

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

The PDF contains multiple external links and a heuristic firing for a 'download button' lure, indicating an attempt to trick the user into downloading a payload. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=james+stewart+calculus+8th+edition+student+solutions+manual PDF link annotation
    • http://prolac.ru/lapowesapezwqozk.pdfIn PDF document text
    • http://summ-green.fun/tegawedufofifu6z6a7.pdfIn PDF document text
    • http://powerhdniy.space/63823706063m5scw.pdfIn PDF document text
    • http://voiprormul.xyz/warehouse_safety_checklistroo2n.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jiLhbvQ/ticket_to_ride_new_york_board_game_review.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/8212137658.pdfIn PDF document text
    • http://electriccannoz.club/cretsiz_yanl_porno03dsb.pdfIn PDF document text
    • http://alisaborodaenko.design/87400403898ff71w.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/dhdicqK/pavixusenivowejimoru.pdfIn PDF document text
    • http://prazdnikprosto.ru/adventure_of_jojo_bengali_full_moviemh2ht.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/minn_kota_endura_c2_trolling_motor_with_battery_meter.pdfIn PDF document text
    • http://qunit.space/89601285534h8ay9.pdfIn PDF document text
    • http://thailandlove.site/670878332854hwyd.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/wawuwaresitonobodrwt.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/2ghiwK6/score_hero_online_free.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/does_delta_sonic_do_inspections.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pezamax.myartsonline.com/python_machine_learning_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/rumepige.pdfIn PDF document text
    • http://nonomajemiw.rf.gd/7066049555.pdfIn PDF document text
    • http://molopafefo.rf.gd/define_bulletin_report.pdfIn PDF document text
    • http://guberiwexoza.rf.gd/dumusomusedidijewupa.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/juvosugajodo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/samozogurijovat.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 5336 bytes
SHA-256: 237f47d62489086e52981c06266225f6e84f8ebd0cba1662ce0d993bc938465c
font_01_sfnt_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 10728 bytes
SHA-256: 8008e450feaa8604a88c9219541bd0f05531da6198d9f3d0fd5794f158c614fe
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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