Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64810ccb594edd8…

MALICIOUS

PDF

84.2 KB Created: 2021-02-20 14:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c445cfbf3d97558d57c78e402b3ac80f SHA-1: 63bd33098f622e84d03c91941f601077db86a5ae SHA-256: f64810ccb594edd8e6b609d2392893cf526a6d5719469a28c8662f0baa89936e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=tutorial+ka+matlab+kya+hota+hai PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_5fdc1001a0c76.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/3728600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_601848ed5a7e4.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/UFi4Sgc/touch_n_go_ewallet_gsc_promo_code.pdfIn PDF document text
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/24604.pdfIn PDF document text
    • https://penaxixix.weebly.com/uploads/1/3/0/8/130813526/funijilirafuxux-lidik.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/giagdkZ/bitasiv.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/igi4ifv/the_communist_manifesto_book_cover.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://fedorahosted.org/lohitIn PDF document text
    • http://jidabalelibixu.rf.gd/critical_angle_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/guided_meditation_apple_watch.pdfIn PDF document text
    • http://bizifopijosegu.epizy.com/arteriovenous_malformation_vs_cavernous_malformation.pdfIn PDF document text
    • http://zegemipufe.epizy.com/armaflex_foam_sheet_insulation.pdfIn PDF document text
    • http://vekaxuluxixabev.rf.gd/ice_troll_cannon_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/functionalism_in_linguistics.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/schneider_dc_mcb_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/online_business_in_nigeria.pdfIn PDF document text
    • http://gipumupanaw.rf.gd/bdmobi._com_song.pdfIn PDF document text
    • http://sukasorepej.rf.gd/aranmanai_2_amman_video_song_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/56242950871.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD132 4660 bytes
SHA-256: 88e7b0c55119ff38f92c91aec4d15849ecfa6504ccfa0b728a7da763823a1a09
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10588 bytes
SHA-256: e562cd276729ad52045e95714c562c2c253957c227824950f6432381d7e4e1db
font_03_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_04_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 10460 bytes
SHA-256: a9c66fcecef979bdb51a374bd38c8f3073b7f66854f40340cc15f494467f9d1d

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