Malicious PDF — malware analysis report

Static analysis result for SHA-256 4542df99b536c644…

MALICIOUS

PDF

65.8 KB Created: 2020-11-10 10:21:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f30245445c103c7720ab2a3e474f657c SHA-1: 599772fd484739d771fb52c9f1ddefb7e72dd622 SHA-256: 4542df99b536c644372666ce5cb6dab55453ab89c783123eb53852219550d700
176 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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/123?keyword=rolfe+state+bank+pocahontas+iowa PDF link annotation
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/bfa10b32244d25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_5fa362d81fda7.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/jusesoruluju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/83cc6234-ae7d-4747-b517-a6f1673389a1/58162076689.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/carsmart_direct_nc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecddb10c-debe-4e4d-9261-1ef1901a1dd8/24499225109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440ca2ba-ace0-48c5-97b4-05f22e64ad5c/different_types_of_cleavage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121d6118-0ecc-46ae-b2c4-5cc92d528f13/53943985897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b699f283-48f3-470d-9880-c7c04bf6eeed/99168055851.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/canon_eos_digital_rebel_xti_price.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/healthspring_provider_manual_alabama.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/bawowunekavoretovu.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/example_of_child_care_receipt.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_off0000c1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AD 5312 bytes
SHA-256: 7ba7d8cf727b42c70b0b471efd1702d9e91c63b7ec1f368e1148f70dc334f413
font_01_sfnt_off0000d3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D8 11256 bytes
SHA-256: 4a563627396e33c5d2ea7f805b124f808cb5066cabd8bf63dd35a5a4573460a6