Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccde50a5ef8915a2…

MALICIOUS

PDF

75.5 KB Created: 2021-02-19 00:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c65c61b20c542a289cd5524aa8a03e5 SHA-1: 33bf6865e7a885783349efc600cc1da00adcbc18 SHA-256: ccde50a5ef8915a28cf0fd94f346f07df95f0d2e2aead5c5847f32003f35d258
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://jacksth.ru/123?utm_term=which+of+the+following+is+not+an+example+of+inferential+statistics PDF link annotation
    • http://onlinetyz.xyz/10585240721i9s5k.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/1gg0iaJ/words_that_start_with_a_children_s_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/Gfhibgf/wugenodujarorubuzom.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/zikudoradumopolepun1y4o.pdfIn PDF document text
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/bomuzezeme-kixup-xakexuwot-nurikidivu.pdfIn PDF document text
    • http://xejevojesinil.22web.org/razer_carcharias_gaming_headset_drivers.pdfIn PDF document text
    • http://rufopaf.22web.org/16298312689.pdfIn PDF document text
    • https://lepifokofufup.weebly.com/uploads/1/3/4/0/134018260/sipetugobuga_regib.pdfIn PDF document text
    • http://milesnires.xyz/best_electrical_engineering_booksuihcb.pdfIn PDF document text
    • http://vezdesami.ru/48001342315n1wj6.pdfIn PDF document text
    • http://nextauto02.ru/31068093687ec2qg.pdfIn PDF document text
    • http://front-glass.website/numuregerz40v.pdfIn PDF document text
    • http://fomaxos.22web.org/happy_birthday_jiju_cake_hd_image.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinoxisajuz.rf.gd/savejepenibiloxiwirerex.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/html_indentation_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/kinetic_and_potential_energy_examples_worksheet.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_off0000e810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 5604 bytes
SHA-256: 6d1e3cc38d40487ece2939aeae4f8e03ca617a467c5515904a9dfb071b485f1d
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10904 bytes
SHA-256: 4f25dffc16ca5d29d07919f1c44dd91aa4694a880f1f1e423aad27fcbd8de799

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