Malicious PDF — malware analysis report

Static analysis result for SHA-256 954b8f8bd5c09dbb…

MALICIOUS

PDF

76.4 KB Created: 2021-03-27 16:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bcf03337f11a3659ecd5f55b0ef67267 SHA-1: 606822e6bd503637d16f17983efffe08fdae8616 SHA-256: 954b8f8bd5c09dbba136da0889d3bf868de0330e049457b644c89fb45902e669
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is likely used to host phishing content or distribute malware. The ML classifier also strongly indicated maliciousness. Although no scripts were extracted, the PDF structure and embedded URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://dafemum.ru/award?keyword=how+to+analyze+data+in+quantitative+research+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4446289/normal_5fd1b99a46189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_601e2d6579ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/dXKJgib/army_tanks_for_sale_united_states.pdfIn PDF document text
    • https://cdn.sqhk.co/munakuvu/u5ifijM/al_quran_bangla_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_60243a87b3709.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/google_safe_browsing_report_error.pdfIn PDF document text
    • https://cdn.sqhk.co/dudumadopole/Iid5ggU/cara_menyelesaikan_permainan_mekorama_level_19.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/OibYjhi/jowubufabigevowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_e44f5a941ba1428ea897dc373cb95e95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/bogowereluxigavimuvapeka.pdfIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_204a6c4c856b4a60940fc19a1693b439.pdf?index=trueIn PDF document text
    • https://f3ea461b-95fd-44cf-949c-5afda193840f.filesusr.com/ugd/a48928_b699174300e845c487d5a78c95c2c2e4.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_2996b4699e834254878e89f28638990c.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_879b7eebb1354a2db1f7a7a02de32db0.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_015a24df4e594abb8a764bd2afd44a2a.pdf?index=trueIn PDF document text
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_b126520c509f4d1f9e39ac7ba2167aa2.pdf?index=trueIn PDF document text
    • http://zusobudem.epizy.com/translate_canvas_reportlab.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/gigeribafaj.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_b7340c33db0e484592912c2d88126689.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/24559063512.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_ae15e1f6cbb14b1c931f8093c2a7d205.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5636 bytes
SHA-256: cd9662c4e875ac1c43726dea88e4d1b1e8997aa1fa49c426629ce25343ae3b12
font_01_sfnt_off0000fd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0A 11420 bytes
SHA-256: b9520262ddf6a0c24e78b2eda7763ef25ce220708918d6064752e1fed093e002