Malicious PDF — malware analysis report

Static analysis result for SHA-256 85904c1eee7a6465…

MALICIOUS

PDF

76.9 KB Created: 2021-02-15 15:20:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 405b0cd7bc0fb35747777a8f30e71bde SHA-1: b464113a38ab104358b8a0f475c6f43d6902bc43 SHA-256: 85904c1eee7a6465bb2964e2cb6d38c315c4a3bc7d2345c92ce5524952af65f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=how+to+properly+hold+a+combat+knife PDF link annotation
    • https://govumiseli.weebly.com/uploads/1/3/1/3/131380651/kuwokipebirunus.pdfIn PDF document text
    • http://e-devletturkiyeaidatsistemimgovtr.com/583756518589wtmu.pdfIn PDF document text
    • http://healthyforczechrepublic.site/gofelotoguxolarifimux24txq.pdfIn PDF document text
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/luribagipexonuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5fccd72fc84ad.pdfIn PDF document text
    • http://goloszauniver.fun/review_game_sniper_ghost_warrior_23e65n.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/54e4a409e415.pdfIn PDF document text
    • http://specialsale.info/roruzimexov5caq8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445570/normal_5ff7f3d1e319e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ff5028de50bf.pdfIn PDF document text
    • http://zoompol.xyz/allavsoft_video_er_key7g732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_600c1a0575399.pdfIn PDF document text
    • http://lotsmen.com/legend_of_zelda_sheet_music_violinvuddn.pdfIn PDF document text
    • https://xegadoponuxi.weebly.com/uploads/1/3/0/7/130775279/2549682.pdfIn PDF document text
    • http://shop-kid-toys.online/con_que_trabaja_tu_amiga._que_se_mud_a_portobelo._2._que_vende_muebles_baratos._que_trabajbamosd1tco.pdfIn PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/79f16a.pdfIn PDF document text
    • http://startovaya.ru/barnsley_council_tax_refund_form93nxg.pdfIn PDF document text
    • http://veronaital.space/candy_washing_machine_instruction_manualbk96b.pdfIn PDF document text
    • https://toromadon.weebly.com/uploads/1/3/4/5/134523466/givixalalexadid_roruf_lutibivoj.pdfIn PDF document text
    • http://bezprovodov.guru/pabazovazejeleg87bsi.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_off0000f056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 5576 bytes
SHA-256: b8417566a94b9ee7536b104fb6bd5b54662d7c100be3b8e8e10b8003e46c5103
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10632 bytes
SHA-256: c71d28045c210b3c0f99ec46678d3f8aa387f26e4e518175970819ca46ea785f

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