Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da6690496da7e23…

MALICIOUS

PDF

81.0 KB Created: 2021-04-08 09:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1070f52d4c8d6d143ce2d068731d37fb SHA-1: 205643dce5f03f1c5b2556debeb4fd1011b5369a SHA-256: 3da6690496da7e2332a662b470bdef9537d60500fc79338e6b9ad2a2369d811d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous external URLs, some on disposable hosting, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation and a lure for '6th grade math practice pdf', likely to disguise the malicious payload.

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://pelibifir.ru/123?utm_term=6th+grade+math+practice+pdf PDF link annotation
    • http://eslife.pro/31885291736d337d.pdfIn PDF document text
    • https://cdn.sqhk.co/kunawako/WYjcfjx/project_cost_plan_excel_template.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/dajewatewedaa3dem.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/gjmVfhV/44653491486.pdfIn PDF document text
    • http://wufusigemaxegok.iblogger.org/fokovijugal.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/fpuXigR/jepivajojufimu.pdfIn PDF document text
    • http://jumazeg.iblogger.org/53568553400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_60077cb60395a.pdfIn PDF document text
    • http://naturalgood.space/faxagezurimokilikaruivmrq.pdfIn PDF document text
    • http://teleporttur.ru/dark_souls_2_bosses_guidezalon.pdfIn PDF document text
    • http://podipotekoi.ru/hearts_of_iron_iv_usa_guidevckjr.pdfIn PDF document text
    • http://uspex22.online/how_to_make_your_own_beauty_face_mask_at_home_easykn1c1.pdfIn PDF document text
    • http://jabodaligononu.iblogger.org/jurnal_konsep_pendidikan_islam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5fcaad0baac12.pdfIn PDF document text
    • http://medicalpracticementor.com/mac_5500_service_passwordzxqhj.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/oHjaAhe/atif_aslam_songs_mashup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_991b5255c733404d803c21691912f082.pdf?index=trueIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_784ad4f4a2624c26b7cc41836978d4c1.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_75408c4bfc9b489b8ae679bb4d108c55.pdf?index=trueIn PDF document text
    • http://kivekovojador.epizy.com/41221505934.pdfIn PDF document text
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_627e596690864f95a265a8d2b7ee72bf.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_c5ecd1a47ba048cca3f7fc0124ffc7fb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 5416 bytes
SHA-256: a40aaa0150a8bf7b26c9a4f4e6db49ce84acac73ed114844fa6015a4197fff98
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10756 bytes
SHA-256: 1f0b2a45c88a9f9373b1c1ddd5054da9e2e56a975814a3d5cb441c3290187ce0

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