Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99915940dc02700…

MALICIOUS

PDF

73.5 KB Created: 2020-11-25 16:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ef77f1854ad7d0f1696a5df5a3d903f8 SHA-1: 93f444e83570b92f494fef975d89222cc23a58c1 SHA-256: a99915940dc02700680a2811bd324fdce7f9e5e0cf7adb57dae0a520136de96e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is designed to link to a large number of external resources, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=millers+falls+miter+box+models In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f93c81063f44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_5f8b1a0262d5a.pdfIn PDF document text
    • https://pabeliribid.weebly.com/uploads/1/3/4/3/134384766/9397ea0ac9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fa4751de7c09.pdfIn PDF document text
    • https://vubujoxesawuzar.weebly.com/uploads/1/3/4/4/134476738/bekiwikuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d2c2b41-0ee8-480f-82e5-a2bf6b2b1f34/the_perean_ministry_of_jesus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58581200-6dbd-425c-b836-4ab3ab5e44b2/passion_lisa_valdez_read_online.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/jquery_ajax_post_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06e381c-34b4-40a6-8767-6c2ec2b63fbe/morudadaradena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbe1bee-f0f4-4068-8cac-2202ff869c27/53012452682.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/60127492414.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/40911133045.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/overview_solutions_worksheet_answers.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EC 5264 bytes
SHA-256: aefe7d296a817d722ac77f96f040640ffe3707bfc0d624ef1fb7e5c9b8a1a62b
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 6388 bytes
SHA-256: af4bcb8e235d3d60d7c996afdf06bf3b293b3cd59d8f0dfb893527aa461ccfab
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10904 bytes
SHA-256: b9880bda43efcd6bb0ffe46ebe8a39ee4e0390b364815ffca36bf77366058c1f

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