Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fbc1b7d2874061…

MALICIOUS

PDF

109.6 KB Created: 2021-02-24 05:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7614c08340dc129ef180804f9ac89009 SHA-1: d2874c93f8dccc9c7d760100960b127891022d7e SHA-256: 58fbc1b7d287406100e8a8abaae6657aeb33fc557caedd2fad8582097f8f26ed
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage embedded JavaScript or other exploits to facilitate this lure. The primary IOC is the external URI pointing to a suspicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://bologen.ru/strik?utm_term=clear+memory+omron+bp742 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6026f80dc7ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_601edc4f3c0e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474211/normal_6001174e5e114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376621/normal_5fe878bc394e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fcbbb4df3cf4.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/fUXO0XO/50529919306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fe019a595f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446646/normal_5fca83b7c218c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_602574e9c9f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_60292c714396b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490547/normal_6003a98bb116c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_6007202814a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_603343714cf60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_600b029cbaa2e.pdfIn PDF document text
    • https://cdn.sqhk.co/sexifirume/j0hg6ai/18415076313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6010110f6916e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_601e8ab435ff7.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000156ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AE 5412 bytes
SHA-256: fe454110f80dd7ac4de20a8dddd335af289f4f758c4608a7b2e6fae00372b0d6
font_01_sfnt_off0001694e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694E 1644 bytes
SHA-256: af343f210f6ee0dc4015368719f85e5dd2926339547b5bc998c98aa0d04460d2
font_02_sfnt_off00017178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17178 5232 bytes
SHA-256: ba00ed0126fe0a4fb3b0c4a4d4b0b63461e74ab155e31aaf88812fb7fcec7dca
font_03_sfnt_off00018342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18342 10848 bytes
SHA-256: ee923c0f51368c9937f9e9017ba4a0083f73a960e2a19807797854ebac615159

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