Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f82856ccc159c0…

MALICIOUS

PDF

87.1 KB Created: 2021-03-25 11:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 43a48097f8505335c81cc8e7ecd0d4f2 SHA-1: e696d52e3e4c263a010bc27e61ce96b4db050d69 SHA-256: b1f82856ccc159c03afd0ad3fe29f9a46fcc51e0b30971357c338964fdfabe36
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a site that likely hosts further malicious content or phishing forms. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=resumen+de+las+tres+guerras+carlistas PDF link annotation
    • http://kino-vezde.ru/976888757461jgrc.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/awesome_god_michael_w_smith.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/gingival_keratinization.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/levekir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_60242592e27e6.pdfIn PDF document text
    • http://hhizmet.com/dd_ee_players_companioncy6h4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_60496ebc09f14.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/greater_than_less_than_fractions_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408463/normal_6011441b18918.pdfIn PDF document text
    • http://lozolupamo.mypressonline.com/nanoparticles_characterization_techniques.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/programa_festival_internacional_cervantino_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5ffa346f5460e.pdfIn PDF document text
    • http://biolinkus.me/tumblr_girls_g_eazyanfhj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469353/normal_60054016295c1.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/how_to_fix_lg_gas_stove_knobs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419441/normal_5fe0afe4abd78.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/davijemejulafofutovig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_604794fba2512.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/zakunafu/english_to_filipino_dictionary.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/holy_quran_book_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/how_to_fix_emergency_brake_on_john_deere_gator.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/86723640822.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_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 5268 bytes
SHA-256: a4b5c0fd73dfa2e37e2103a2d0af3168239ed46bce3546dfff02f74ba99cf775
font_01_sfnt_off00012806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12806 11500 bytes
SHA-256: c5bb1b6884e5d669502d41bc1af44d76d4cf2c77f1c1bcfc9418a64e4564ac14

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