Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a859a40688b5e09…

MALICIOUS

PDF

74.1 KB Created: 2021-04-06 04:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a0e3a46dc1b25002b7a8575181fa5fe8 SHA-1: 4029494bcb52a2c11bd534ef859307b110065f79 SHA-256: 3a859a40688b5e09a30104cba6ff002bf0f5ae299feb96654fc9e16a2cbad0a6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=obligations+and+contracts+by+suarez+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367940/normal_60149e0323a08.pdfIn PDF document text
    • http://busibear.com/5835471174591xyy.pdfIn PDF document text
    • http://znatural.space/turiramafelufogidfzhz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_6016c5d078efb.pdfIn PDF document text
    • http://bopodimo.iblogger.org/hidden_truth_-_forbidden_knowledge_it_is_time_for_you_to_know_steven_m._greer.pdfIn PDF document text
    • http://aycotoro0.xyz/hindi_alphabet_full_video_kgfmriw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6042e2e2ec92e.pdfIn PDF document text
    • http://nutristrike-shop.ru/673880789655eako.pdfIn PDF document text
    • http://civiliscmq.online/xogevinurzahf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosirokuki.epizy.com/14284044515.pdfIn PDF document text
    • http://pelubameta.epizy.com/pedinadew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d515689-e28d-49e1-84b6-59b5f0f46f8c/fe_exam_prep_course_nyc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/275e98c0-b37c-4639-ba07-066b656ee767/22600040533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7457fd89-be25-4fa5-b3a3-f4d7316d1d16/which_of_the_following_is_included_in_a_functional_behavior_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637fc0c3-d191-43c4-a1db-4f06d76bc6fa/68000622376.pdfIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_66f15fc0da0c461bbd77a5907e7b5b9a.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_879c4f740e524f30b0706c34e45271b7.pdf?index=trueIn 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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5644 bytes
SHA-256: 1d7fd98707f4f557b1154acd27a9a3c390be106651f6a56372a9b7e036356c21
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 12616 bytes
SHA-256: 28a9b3608f9345de5d79faf4580cad969921eedceb1c3ed44f2cd9f34556d94c

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