Malicious PDF — malware analysis report

Static analysis result for SHA-256 327145145a402e97…

MALICIOUS

PDF

73.8 KB Created: 2020-12-31 06:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 14be7d2651fe0064c3ebb0d44b840db4 SHA-1: d2499ef0653c86c927f07ab8049cca181c271afe SHA-256: 327145145a402e97f3715d55291fff54c58050e8177d4ff050db68c08640925b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to redirector infrastructure or potentially malicious content. Heuristics indicate it's a link farm designed to redirect users, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=psychology+chapter+6+learning+review+worksheet+answers In PDF document text
    • https://cdn.sqhk.co/xafiguzi/aYojcih/sunrise_wake_up_light_smart_alarm_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/djjc7hb/clash_of_clans_hacked_server_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5fa0612bce097.pdfIn PDF document text
    • https://nadaxobolimige.weebly.com/uploads/1/3/4/3/134365666/604ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5fe6331411646.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/6b7a8f75-ae02-471d-846a-a650e1030000/the_coffeehouse_investor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/symmetry_of_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b6ba680-ba3d-4a44-b874-25aedbea548c/sunohara_sou_no_kanrinin_san.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612c0fe2-bf6a-41a7-ad4e-b501fb5f264a/58678036238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705c1c41-ab5b-4185-8550-bfbf0b16c645/jukumirok.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_off0000e4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C2 5668 bytes
SHA-256: 647a0475d86e8f8125737e4254a9590c933cf9ca267b86f4b06ea7460f5f6214
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 9864 bytes
SHA-256: eccae9dcff5578b23d09c11da7b3341d21e23d880670f9d123404ace0bc85cb3

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