Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b796ebc1f21affe…

MALICIOUS

PDF

69.1 KB Created: 2021-03-21 10:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b79a33afdb37e42fad836a017850a7 SHA-1: e3f7d82a571baa44eff277557b328a6b4ec25e4a SHA-256: 1b796ebc1f21affe4ca65c0f89b2e353f6678c197db4b4e7fa0ab196b42475f1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'yugioh duel links how to get unlimited gems', indicating a lure for potentially malicious content or phishing. The presence of multiple PDF link farm heuristics and ClamAV detection strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=yugioh+duel+links+how+to+get+unlimited+gems
    • https://ruxebawinafa.weebly.com/uploads/1/3/0/7/130776533/1998104.pdf
    • http://xilexevu.scienceontheweb.net/82629495575.pdf
    • http://witaxolexigabi.mywebcommunity.org/the_spectacular_now_pelcula_completa_en_espaol.pdf
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/luluraduboxevulimim.pdf
    • https://kisuvali.weebly.com/uploads/1/3/1/1/131163683/c8e8932fec8b1.pdf
    • https://solugelefeko.weebly.com/uploads/1/3/0/7/130740562/2240956.pdf
    • https://cdn.sqhk.co/fivuwunar/jhjipii/jideladosumuz.pdf
    • http://gifazat.iblogger.org/duniriruk.pdf
    • http://bigojojodun.iblogger.org/guide_michelin_restaurant_figueres_espagne.pdf
    • https://cdn.sqhk.co/lekusovu/Cigghhg/41859062077.pdf
    • http://mamuzomilap.iblogger.org/cause_and_effect_of_water_pollution.pdf
    • https://cdn.sqhk.co/riwifesineji/gjiggiw/sinimub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tikomiwewo.atwebpages.com/7th_grade_math_staar_practice_worksheets.pdf
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_0424dfdab6ee45f6b5435f37d3201ef5.pdf?index=true
    • http://doriponesarom.myartsonline.com/what_is_the_importance_of_potential_and_kinetic_energy_in_our_daily_life.pdf
    • http://zirutabu.myartsonline.com/gexepoxixabotovuti.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_69e00d36415148f1acac79856b0ae22f.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_e15a9eade4f142809cdbd68c344534cd.pdf?index=true
    • http://xugemogi.epizy.com/who_fixes_power_washers_in_my_area.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_ea5be8f8d1814e83ad4beb4b73767d86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/49c2ba8e-f118-4b33-8329-024715f2c8af/elements_of_film_pre-production.pdf
    • https://uploads.strikinglycdn.com/files/ee98afd4-a6d2-438a-bffa-2c611396e579/brother_pt-1290_replacement_tape.pdf
    • https://uploads.strikinglycdn.com/files/4a5e6c80-c149-472f-ae5c-5c0da726595f/8099623018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fe.bin
ed92e49c3c0903ebb8e5bef0e80bb51e24a86971d353171b4f3f5c077fca63b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 5052 bytes
font_01_sfnt_off0000e21f.bin
a383220f8ff51ebbbeb0449c25b0cb4e292f1a0dfce34e6cf03ed7fc1cd815d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 10748 bytes

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