Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24673443c25e53e…

MALICIOUS

PDF

81.7 KB Created: 2021-05-01 22:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 176188a8939e1223286746415b9b8de4 SHA-1: 7a473822441c6ffb65e44ee1ba1925107f3b693b SHA-256: d24673443c25e53eda8b383d2d0118424dfa0af48a6bf374ce96ba81a770170c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/strik?utm_term=que+es+el+sistema+tegumentario+humano PDF link annotation
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/67e677555c7.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/66807388914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_600a90ae77cb5.pdfIn PDF document text
    • http://detobusukited.iblogger.org/lord_shiva_mantra.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/miserere_allegri.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/zipimuvus.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/engineering_drawing_paper.pdfIn PDF document text
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/bofodogodubokos.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/cape_town_airport_map.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/2006_chevy_malibu_repair_manual.pdfIn PDF document text
    • https://valezuxaj.weebly.com/uploads/1/3/4/6/134650604/3f82dad6597d.pdfIn PDF document text
    • http://kiwirixup.22web.org/raxapajepa.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/wood_top_coffee_table_with_metal_legs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6062213b1a64c.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/free_german_to_english_translation.pdfIn PDF document text
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/847ee138cb768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bazimiguzanuv.rf.gd/zejafedekigiminanufebu.pdfIn PDF document text
    • http://kapezipejusabop.epizy.com/bapaxarisulijefudisena.pdfIn PDF document text
    • http://joberemig.atwebpages.com/beauty_and_the_beast_piano_sheet_music_free.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/24205408402.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/o_positive_blood_group_diet.pdfIn PDF document text
    • http://firabano.epizy.com/angry_birds_online.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_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 5160 bytes
SHA-256: 922ded01ae2a4b02b6387ebc5914419abe91c777d091630300ddb9ba8dbdf8c7
font_01_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 11324 bytes
SHA-256: e86f49db2cdf504ce27e8bc5137c250b88bee33b1ec4834101aa849d088d6bfb

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