Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfae723082278874…

MALICIOUS

PDF

70.5 KB Created: 2021-02-26 17:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 522d9f8009cbc304d3966f5d6b664619 SHA-1: ae7d672eff44dd605781e3067dcef9c399c501a8 SHA-256: cfae723082278874d1b13ebee66621f5c5df113a47a56b0f83df21a4c69a1b6d
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://xajibur.ru/award?keyword=how+to+forward+calls+mitel+5330 PDF link annotation
    • https://cdn.sqhk.co/waxixojapu/igNlW1P/99715505119.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/gihajjO/ninemiwinar.pdfIn PDF document text
    • http://lasns.fun/how_to_pronounce_egyptian_hieroglyphicsn2w5m.pdfIn PDF document text
    • http://sreview.online/partitioning_thousands_hundreds_tens_and_units_worksheetst91gf.pdfIn PDF document text
    • http://netlysy.online/16151980946qcld2.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/tokamokozinuse.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/hKFBkcQ/business_insider_tesla_stock_price.pdfIn PDF document text
    • https://bexavulurezil.weebly.com/uploads/1/3/0/7/130738929/f5ee4532c198.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/pilinonopizigotul.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/pilazi/lagu_ost_ajari_aku_islam.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/65038001754.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/segidetijarujamezegufeza.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/boarding_pass_online_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/app_store_iphone_4.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/hp_probook_6570b_ram_slots.pdfIn PDF document text
    • http://zupitatip.atwebpages.com/15697329981.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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 5652 bytes
SHA-256: fbc512ea7c5b90b6ba7b23c50ae52f710d0dc8d1c35501816186dbc65dedbbb6
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 10840 bytes
SHA-256: bb845728f9b4b2157ae038230594f1e5eee0fb9b8972d370088f3ec18a5eea4c

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