Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7a51890548abd4…

MALICIOUS

PDF

69.6 KB Created: 2020-12-23 01:59:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c93b0ee6af9aed7720748693627a5c3f SHA-1: 8f64a609c20adcc7a9f96eb9e4453d0e470c06d4 SHA-256: bc7a51890548abd464d3cedef2e78f83abe5e4a4a67e7b1c9e7bfeb1db85c586
216 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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9995

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://traffset.ru/strik?utm_term=fake+bank+account+balance+prank+call PDF link annotation
    • https://vedixoba.weebly.com/uploads/1/3/4/8/134864822/xisawiginose.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fdd8336dddd0.pdfIn PDF document text
    • https://xeluxujuw.weebly.com/uploads/1/3/4/4/134438775/wonubifof.pdfIn PDF document text
    • https://wadezirukabag.weebly.com/uploads/1/3/4/6/134668274/wasigaji.pdfIn PDF document text
    • https://mosevulex.weebly.com/uploads/1/3/4/8/134860143/kobapadabanu-gibuteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5fb03a416e3c9.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/najipavez/66747811734.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/iferror_vlookup_google_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/appium_version_1._6.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/free_vevo_app_for_android.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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 4908 bytes
SHA-256: 579f16444deef809339fd5f4f4c3aba6acc26d305395eb2f14b2f0d5d4fd38c7
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 10084 bytes
SHA-256: 5aeff931f8aceec9701f8fafd3451e297973adc40ad16a9f95e13d2328fb8b01

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