Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac78f80045ebb48f…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 19:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 938c0d84d180b78e692c1159e6f08d0b SHA-1: ee074b4b9e0401f27bc2f35a06db00e2d3336234 SHA-256: ac78f80045ebb48fa5c36dab7c55c61ca499a4094aaef04ab2c7a305116e53a0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leading to a phishing page or a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/123?utm_term=kookaburra+bat+weight+guide
    • https://puxofigu.weebly.com/uploads/1/3/5/3/135347112/3260483.pdf
    • https://liguroxuf.weebly.com/uploads/1/3/4/4/134443360/5195264.pdf
    • https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/09aaef.pdf
    • https://fozegujulukov.weebly.com/uploads/1/3/4/4/134459046/sufuj-suxomomu.pdf
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/4517799.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c8093add.pdf
    • https://bilukejax.weebly.com/uploads/1/3/5/3/135392742/38c5da483e16b07.pdf
    • https://vulodimov.weebly.com/uploads/1/3/4/8/134880101/24eb3d98ad583.pdf
    • https://static.s123-cdn-static.com/uploads/4368763/normal_6006ab12cb197.pdf
    • https://finaxapiw.weebly.com/uploads/1/3/5/3/135301963/ebffba79.pdf
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/pawipikufa.pdf
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/3ce06fc27751923.pdf
    • https://tujewadis.weebly.com/uploads/1/3/5/3/135312055/4487264.pdf
    • http://tofotibuwul.sportsontheweb.net/nebugafanabebe.pdf
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600bca1f92f8e.pdf
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5fca6b980082b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_ddada879e86c4993b73f142377c9796b.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_6bb0157d9a8e4a798d317359b16fffe9.pdf?index=true
    • http://najijojovigom.myartsonline.com/trait_emotional_intelligence_questionnaire_teique.pdf
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_743218eb91f6426384a23cd97dfd4b60.pdf?index=true
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_f63a0202cc0749deb54c8f17d22283b3.pdf?index=true
    • https://1e6856c5-1481-42a3-8d1a-2a2567f9fa5a.filesusr.com/ugd/a8b033_984af46b5f7e467cadb4100c3cd810ad.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeaf.bin
e730f99820b2b55614baecec87e54fa214ab33757eec7e795209d0f4d08a49ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 5144 bytes
font_01_sfnt_off00010036.bin
affa83a4cf030d4e3f7088b6e8f2996ba280e7f7553344bb12edd6c85dfcfed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 11184 bytes

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