Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fe3dca8c7037f7…

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 08:53:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 31c6001fbf9e3bb447d8ef6729831028 SHA-1: 309f0d7f7f3cdebdb22980fe9fa4abd7a62ee8ed SHA-256: 56fe3dca8c7037f729c0016c14f2e8e0c18db4ac1406c87973d38be4e424528c
166 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains multiple embedded URLs, with a high-severity heuristic flagging an invisible link to a suspicious domain, suggesting a lure to a malicious website. The document body, though heavily obfuscated, contains references to wkhtmltopdf, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jumiwimov.ru/aws?utm_term=what+is+meant+by+a+rule+based+approach+to+ethics PDF link annotation
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/71f9f07e63eb692.pdfIn PDF document text
    • http://cheapestshop.xyz/tap_city_building_clicker_go_kartthy2x.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/g0fhjja/video_calling_samsung.pdfIn PDF document text
    • https://nomozusosowewox.weebly.com/uploads/1/3/1/4/131453154/7639852.pdfIn PDF document text
    • https://cdn.sqhk.co/tonufipu/5jgij4E/76254653157.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/hMhcZjj/bonagelaserotepavexowof.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/57541914169.pdfIn PDF document text
    • http://nutristrike-shop.ru/58240463278ufc23.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/lenovo_ideapad_y510p_ssd_upgrade.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/wifuxufo.pdfIn PDF document text
    • http://dezlice.ru/mutodegunifiup0g.pdfIn PDF document text
    • https://sinipipa.weebly.com/uploads/1/3/0/8/130874509/8273951.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/new_york_times_acrostic_answersh1net.pdfIn PDF document text
    • http://sabofogetazo.22web.org/25571989880.pdfIn PDF document text
    • https://pofitokibifezaf.weebly.com/uploads/1/3/5/3/135394855/zabefiji.pdfIn PDF document text
    • http://tophomework.space/demijezanojonelipulut0b407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wolujalazov.epizy.com/books_like_neil_gaimans_american_gods.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/why_has_my_chest_freezer_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/bogonap.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/how_to_factory_reset_an_hp_pavilion_dv6000.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/hoover_windtunnel_central_vacuum_troubleshooting.pdfIn PDF document text
    • http://ponadik.epizy.com/xotazenapexorusumed.pdfIn PDF document text
    • http://mifojizu.myartsonline.com/2_digit_subtraction_with_and_without_regrouping_worksheets_2nd_grade.pdfIn PDF document text
    • http://zitotinew.rf.gd/catholic_english_choir_songs.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 5568 bytes
SHA-256: 159b3ab1d169f287b51f68d97df801ad31d992524141e6409c1d14c869504612
font_01_sfnt_off000108ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FF 10520 bytes
SHA-256: fac0318f6d64bcd742a9d1b3bbb3e9a1c681d74ca839b69fb2ec5eeea7eb390a
font_02_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 16072 bytes
SHA-256: 5daa2859ac1cba10c019d93b3654b7392607614b218f12f6681e5ae5f126ae4f