Malicious PDF — malware analysis report

Static analysis result for SHA-256 d743dd08508cf704…

MALICIOUS

PDF

101.4 KB Created: 2021-03-15 23:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ff523c37399e4de3a53e76998559b168 SHA-1: 9a223e4c73e0abf6801fbab8380f4f52a15648ba SHA-256: d743dd08508cf7043304e520192430da13264e21c7b5ec22b9dcfa6bcce82c2d
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 0.9931

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+enter+data+in+a+pdf+file PDF link annotation
    • http://boraguw.medianewsonline.com/piano_adventures_level_1_audio.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/jgilgfj/guide_for_talking_tom_hero_and_tipsy.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/71574198843.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/aqHgh0i/campgrounds_near_monument_valley_az.pdfIn PDF document text
    • http://roboludawu.mywebcommunity.org/how_to_speak_any_language_fluently_alex_rawlings.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/html_to_converter_i_love.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/87271620110.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/pgcghju/visodomukifami.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/divog.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/giiftla/sifazazovelalat.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/59369758920.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/the_little_sas_book_6th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/nunologen/ZJ5XQDh/fapizudugajozejarid.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/juxesuzuludezegofixuvoxa.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/kenmore_gas_oven_igniter_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xifeloj.onlinewebshop.net/simple_english_novels_for_adults.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_1aa1882812754c28a1fc73fd7fac3831.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/gixumigukeromoviger.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/gomorrah_season_guide.pdfIn PDF document text
    • http://xonolori.atwebpages.com/5103576757.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/libralisme_dfinition.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/30567190739.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_deca3d986b0d479d8c7a1411789e82b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/rainy_days_and_mondays_quotes.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_98d33a2a811848209eb5645d03ec965a.pdf?index=trueIn PDF document text
    • http://zesafemumibow.myartsonline.com/9841221839.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/78810467991.pdfIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_20b245da0d4242a2b07460d2e7f70424.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F60 4696 bytes
SHA-256: 1a2cd3d6ca6f2a1706d3b2a93af5a3bcdf4dd960d9db8f6b13a142d6d2ecb6e7
font_01_sfnt_off00014f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F68 12348 bytes
SHA-256: cf786047b89f2f3ddb2834f81cabe52e8f5358472b413e20108e8059aa160776
font_02_sfnt_off0001796c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176