Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9b0025287d441…

MALICIOUS

PDF

79.1 KB Created: 2021-03-29 00:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4014333973584bc989e136a108f23b61 SHA-1: 23db8f4f80722f637780ece10d16603e639d5837 SHA-256: 8bc9b0025287d441b6cdb5698fb5f6e14d7f90b045a4511e0b9b72e19ca00a81
186 Risk Score

Malware Insights

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

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 0.9997

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 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.
  • 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://mezovuduw.ru/award?keyword=bepantol+derma+creme+bula+pdf PDF link annotation
    • https://cdn.sqhk.co/sofizagumup/vih3Djj/92817906235.pdfIn PDF document text
    • https://cdn.sqhk.co/noradinez/ZyiihIJ/51801574149.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/rolling_stones_list_of_the_500_greatest_songs.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/52943793271.pdfIn PDF document text
    • https://jutegejedexugak.weebly.com/uploads/1/3/5/3/135384922/rabap_babipoxafer_fogerixabimi.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/92211460009.pdfIn PDF document text
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/dexenuwolibixabumosa.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/28824795530.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/kotanamo.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://jetovalanowu.weebly.com/uploads/1/3/0/7/130739462/73b8b83.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/6fceb83deb4fa3.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/schoolhouse_rock_live_jr.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/lepatojadila.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/lezuxipilavosivemova.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/bihar_si_previous_paper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/gjjhiaV/zombie_3d_gun_shooter_unlimited_money_download.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/kepama.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/lhDJwji/systeme_de_gestion_de_salle_d_attente.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_e2538806630a4183bbcaadf4eb68bb2c.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_a29a108ae1274360976ca77c2a077672.pdf?index=trueIn PDF document text
    • http://xonolori.atwebpages.com/artificiality_and_enlightenment_from_sociobiology_to_biosociality.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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 5312 bytes
SHA-256: 5895e4f9a0d4e4f714ca0d538370ef8baee4fbf06ce38464cea129e094e21fba
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 13528 bytes
SHA-256: 9f1a351471446842a9becc64e6854b8831fabb2b86a21f501136b7c168d0b928

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