Malicious PDF — malware analysis report

Static analysis result for SHA-256 df359db735b66798…

MALICIOUS

PDF

61.5 KB Created: 2020-11-11 02:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d82cf88aebc0d5f426703ecdda3e3aa7 SHA-1: d30991a4489735f280cbfde7ea333fe4665eae91 SHA-256: df359db735b66798c16b7e05bebaaf75f4d463d8f85590cbfc35961a03f2434c
234 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 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=champro+size+chart+youth+baseball+pants In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fab27b69e630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8744575a5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_5fa8117db6055.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/vipamuw_vikosulubokip_gezolotefoliza.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/vuliwisuwig/first_generation_pesticides.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/spring_3_framework_reference_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedb5ca7-1a76-4d06-94ac-c43a39bef5e4/91402905350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4469a9f-d07c-4a7f-b879-489888d2bc46/suzilejokumi.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/tufts_university_campus_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b14d08-ebcc-4c40-8c67-a7081e549cf3/lozuzapamurolep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/880b7e2e-ccff-4efd-87f2-4df3bf149c0c/uc30_mini_led_projector_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/fiche_de_poste_assistant_comptable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84a7e31-63c3-4692-87b3-0336c8c64d96/kofotokujem.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_off0000b0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F2 5372 bytes
SHA-256: e6d33332f2e2556bbd326cf2cec43c42747afa4f29c115f7266f70eea00e40a0
font_01_sfnt_off0000c313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC313 11332 bytes
SHA-256: 310d7b2a92a76fd84bdef9f4d44fc673cffc510ca4e45fe94401953dc3c1f133

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