Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d8dd809b632d2f…

MALICIOUS

PDF

89.0 KB Created: 2021-02-14 12:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6956c27586c128cf74f2225ec173f2e SHA-1: 56962cf489555b52264a9fdc2eac1bcfcbbb3a81 SHA-256: b2d8dd809b632d2fdbd61a28984471f3c1d2b90eec1794fe4e498dade9698ef4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=2d+array+in+c+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_600041823dd12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_5fe1cd0f87ae8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482216/normal_5ffca8972a0ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_601d1248b803f.pdfIn PDF document text
    • http://getyourscore.info/napulekavufakqsm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe937b63a52f.pdfIn PDF document text
    • http://swiss-gear.store/as_cinco_linguagens_do_amor_para_solteiros4g5nd.pdfIn PDF document text
    • http://copyright-help-center.com/443739335929pxp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_5fd77f8daa842.pdfIn PDF document text
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/5537583.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/833587.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/fxUFW2W/candy_shop_bubble_gum_yarn.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/gcgfijC/xukedalekojupajanuk.pdfIn PDF document text
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/gijafanuwu-delibekapib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469849/normal_6025c5526983d.pdfIn PDF document text
    • http://shoop-ff.ru/essentials_of_biological_anthropologyzk986.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/Gjc8jil/amc_cookware_usa_price.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/ib7jvgc/25703476485.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/contraception_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/uc_browser_for_java_phone.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_off00011d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D83 5076 bytes
SHA-256: f11aa5183ed5d6dae3a2d222c7a53d8e2e6c48eb8729097722f00de606b5f2e2
font_01_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 11640 bytes
SHA-256: f5703f6278db1125b12f566a679a86907edfaa2c721c20c3fd7a9ff749794555

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