Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fec51a8305d04f…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 17:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1ce8029970dce14f77a9bf022495be2e SHA-1: 169996deae7b791fd932ff2d31494fa4dc6ac962 SHA-256: b7fec51a8305d04f6fd7093ec8d661f9426bf1c43935cd6cc81bac4eaa3dcc4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=html+tags+list+class+10 PDF link annotation
    • https://cdn.sqhk.co/zekoparan/kggnthe/37162573896.pdfIn PDF document text
    • http://ladukusuga.22web.org/61895529375.pdfIn PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/zipiponorota_kirebiz.pdfIn PDF document text
    • http://tolunisusij.22web.org/ginanotaz.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/jhgjjen/liliga.pdfIn PDF document text
    • https://ribebolavat.weebly.com/uploads/1/3/1/3/131398139/bakat-vexesazas.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/antibioticos_clasificacion_y_dosis.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hdgdPie/flower_pot_painting_ideas_easy.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/bootstrap_modal_iframe.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/hiRiaje/fear_the_walking_dead_season_2_episode_11.pdfIn PDF document text
    • http://dogusiwimukames.iblogger.org/86572790986.pdfIn PDF document text
    • https://cdn.sqhk.co/livixugakuf/fhhijhb/puviganu.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/kuwuzisitagimalawi.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/EK2geja/nujomukixutixar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe4cd36-5c16-4e8c-a568-11818dd107a7/44747537423.pdfIn PDF document text
    • http://difugarulid.epizy.com/best_army_games_for_android_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0e1b15-96ad-4e2f-b4bd-860ff766910d/26505946644.pdfIn PDF document text
    • http://mubuwinita.rf.gd/jafazi.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/bland_diet_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ea1872-0b31-4bfd-81cd-ee929c456f48/what_does_the_bible_say_about_being_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13406ac-f495-4db4-8c6f-151d2acdbdfd/is_walmart_going_to_have_ps5_in_store_on_black_friday.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 5180 bytes
SHA-256: c705ab2bd2b1a8e54814b0657b190453e346da0028fd3e1dd2e90103e11e382d
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 11572 bytes
SHA-256: 2d7f397a41d6501466ac48348feb700363912977a12f29b8a9f0035405e743af

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