Malicious PDF — malware analysis report

Static analysis result for SHA-256 a768284ec84349e5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-02 03:00:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e35ca9bb76af27ecf5912ac880561c70 SHA-1: 4d1ba2941e51d63b67d4a317c088341d97237cc4 SHA-256: a768284ec84349e51121e05ae383745f24409443c87c5c7a0bfc23e8140abb1f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/wix?keyword=how+children.develop+5th+ed+pdf PDF link annotation
    • http://zasosidimul.22web.org/44545469693.pdfIn PDF document text
    • http://epipog.com/alif_episode_13o5f0u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_600bcbb375904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443357/normal_601cd073c438d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428331/normal_5feb5366999e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600bf793ef201.pdfIn PDF document text
    • http://nuxagoliwanep.22web.org/vitimupigif.pdfIn PDF document text
    • http://kaxunatinoti.iblogger.org/lipuzarixobusarurojaler.pdfIn PDF document text
    • http://1freedom.space/interpretacion_del_tarot_b._o._t._adgci6.pdfIn PDF document text
    • http://wuxifev.iblogger.org/what_is_intelligent_design_creationism.pdfIn PDF document text
    • http://lexisunat.iblogger.org/nclex_pn_review_questions_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/Xgdgiie/35878603838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fcb71b42c78d.pdfIn PDF document text
    • http://1yamal.space/lyrics_five_nights_at_freddys_2_song_-_its_been_so_longp5d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_603b05e8db40a.pdfIn PDF document text
    • http://goodshopsales.xyz/setapokijifunenezige413ex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafolizol.rf.gd/abbott_laboratories_annual_report_2005.pdfIn PDF document text
    • http://bewebumaxof.epizy.com/marine_ecosystem_worksheet.pdfIn PDF document text
    • http://xepujeroniwazip.epizy.com/greeting_card_template_photoshop.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_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 5124 bytes
SHA-256: 9f1b65646df2142bc886f57e88e759f660cd6bc6fc6fd213ae743b8b9d47f7c7
font_01_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 10124 bytes
SHA-256: bc27800c2ffd922b4e3a9cde0f1cfd59ac50e0889364d8dc434a1dc828427712

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