Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c877280fc25aa34…

MALICIOUS

PDF

117.0 KB Created: 2021-03-30 08:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2342ba7450069bfa3947dd3bf020d126 SHA-1: 936cf0f10dc7adbe2114333246bb6a2e97dbecb5 SHA-256: 0c877280fc25aa341e8d409eacb1e2e4413e9a5811ed8393e1214da04b62ff58
126 Risk Score

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 0.9992

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=telemann+sonata+in+f+minor+imslp PDF link annotation
    • https://xafozidej.weebly.com/uploads/1/3/4/6/134643925/b46e3.pdfIn PDF document text
    • http://inscarusa.info/190540790507h3ht.pdfIn PDF document text
    • http://gayerkan.com/welobawajuoyvvy.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/pirir-lonupekawo-nedibuzamaja.pdfIn PDF document text
    • http://nefritthebestthing.site/positive_action_bible_curriculum_route_668wf9i.pdfIn PDF document text
    • https://gapurosudezejug.weebly.com/uploads/1/3/5/9/135965954/11ad4.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/44373c2.pdfIn PDF document text
    • http://sks-expertiza.ru/zugivevirekemokunipitoa0xvo.pdfIn PDF document text
    • http://tepifugamokeg.medianewsonline.com/brche_einfhrung.pdfIn PDF document text
    • http://lovelyhouse.online/what_is_a_winchester_ranger_30-30_worth8vqme.pdfIn PDF document text
    • http://xoxosedefoxadu.mygamesonline.org/bhagavad_gita_18_adhyay_in_gujarati_download.pdfIn PDF document text
    • http://aires.fun/walmart_black_friday_tv_deals_75_inchs0evb.pdfIn PDF document text
    • http://libertinemodels.com/metal_madness_pvp_car_shooter_twisted_actionn0fi7.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/hindu_arabic_number_system.pdfIn PDF document text
    • http://itawegan.space/status_video_krishna_bhajanlm83n.pdfIn PDF document text
    • http://xadazobisisim.scienceontheweb.net/91916262076.pdfIn PDF document text
    • http://pay-order.info/499560638094v08u.pdfIn PDF document text
    • http://shop-profildoors.ru/swayam_prabha_app_freejyq8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/bald_headed_uakari_facts_and_information.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/esophageal_cancer_screening_guidelines.pdfIn PDF document text
    • http://vumamuv.myartsonline.com/27636045130.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/58706975222.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/attendance_monitoring_system_software_free.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://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_off000172f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172F6 4996 bytes
SHA-256: ffccb35c655165b5a482ec1a284a1946d53cfcf1c46e5af0336572dcdfb11c91
font_01_sfnt_off000183d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D8 13540 bytes
SHA-256: 5e6ebfa3a9ba10b72fdfc5d202bd2378163731fa2c339b5bb79ca26ea9d090ca
font_02_sfnt_off0001aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEAA 16184 bytes
SHA-256: 4360e29b7d2504916afe74d557016965ce00ddb6e9b1d1498b998f2d7a1046f9

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