Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1f75a88b3390f6…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 03:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 66e2ad36fb321cd39c512c411e07eb56 SHA-1: e0c3bc3e6144074016bafffb4ebba17cd8c87f1f SHA-256: 1c1f75a88b3390f6b5cfbdaa1615385e1d099cc292ba0f288a31577680dfb59a
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a link farm, which in turn hosts numerous other PDF files on disposable domains. The document body, though heavily obfuscated, appears to be a lure related to self-help books. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://jottigo.ru/award?keyword=best+self+help+books+for+mental+illness PDF link annotation
    • http://mosebuzixat.mywebcommunity.org/dedupipapekot.pdfIn PDF document text
    • https://cdn.sqhk.co/gobefuvumi/gjhWzhi/angie_s_list_customer_service_phone.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/judakoto.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/oKid16t/ninja_masters_snk.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/tewopovo.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/how_to_use_rain_bird_controller.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/f9d6fd.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/necchi_sewing_machine_threading_diagram.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/nogazusesosaxobop.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/jh1gjek/kegelaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fcbc24099cbe.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/travel_trac_comp_fluid_trainer_reviews.pdfIn PDF document text
    • http://salizurewaki.mypressonline.com/funom.pdfIn PDF document text
    • https://gulikefesagigal.weebly.com/uploads/1/3/5/3/135303577/rexobasip_godifomeguz_datokurobusipot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fda9192a534d.pdfIn PDF document text
    • https://firiwipavixura.weebly.com/uploads/1/3/1/4/131407767/e9de49b44.pdfIn PDF document text
    • https://vomoxolakixirum.weebly.com/uploads/1/3/1/4/131438067/a4622add1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 5396 bytes
SHA-256: a9bcaa8fc129e1fc5dbce3b6fac2d955bc397fb8de33442debed57a6f1be78cc
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10216 bytes
SHA-256: 8450239d2263cce41013b95db4220887f7df2c9daa6ad8de1f8f3fc81716905f

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