Malicious PDF — malware analysis report

Static analysis result for SHA-256 db64e5581e617ca1…

MALICIOUS

PDF

66.0 KB Created: 2021-02-10 18:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 40215a48974b1af633b9ad2f2e061989 SHA-1: 0044f739d0a9946ffedf0eae6cebe92f11e57f88 SHA-256: db64e5581e617ca1228a2e4a128389b04d15d7b1d737899c560ab6ae54e76a9d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, a common tactic in phishing and scam operations. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit the user through social engineering, likely leading to further compromise or financial loss.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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) 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://leonvi.ru/123?utm_term=millennium+ladder+stands+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fe97ff412c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fe73f2ab0d82.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/tVgjsQC/3578206229.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxarogajib/mhgsifv/40728399382.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/nghjhad/vexilar_fl-_18_ultra_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/dibjd2C/bofuja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445888/normal_5fe00c5ccad58.pdfIn PDF document text
    • http://wipalogazagak.22web.org/twinkle_twinkle_little_star_sheet_music_trumpet.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/xjhBjdr/movie_box_hd_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/fixosotefe/FifUZhe/75746821631.pdfIn PDF document text
    • http://logusubunovad.22web.org/zidizafebolafizazu.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/eC2hftC/racing_fever_moto_game_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/50fqcfc/calculator_for_guns_of_glory_pro_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413987/normal_5fe57a38a980c.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/e8ghggR/79497042689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopaxoreje.rf.gd/york_centrifugal_chiller_log_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/sexomaripali.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/perfect_squares_worksheet_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/new_headway_upper_intermediate_workbook_answers.pdfIn PDF document text
    • http://wanudag.rf.gd/teach_days_of_the_week_worksheets.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_off0000c551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC551 5056 bytes
SHA-256: c11665c9daff39e99276751417e974c8809d9114537764fc1d26b09fe62d50c2
font_01_sfnt_off0000d672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD672 10744 bytes
SHA-256: 9d8c3a25244acaf108e48dd79ae1266fd6914feb3c8cd7bef30902d2752a647f

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