Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b16b4ac543af57…

MALICIOUS

PDF

79.1 KB Created: 2021-05-13 16:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfcac96ea260c1f450e08736f54adec SHA-1: 46ae1553ff22b2991ec1430f98d9fca219a0b357 SHA-256: 84b16b4ac543af574237f2a92fe19cdf8b24b6059c9a84b54649554d1d735dfc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings point to the presence of a link farm, with numerous external URLs embedded within the document, suggesting a phishing or SEO manipulation scheme. The primary URL identified is https://pelibifir.ru/strik, which is likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=comma+after+day+of+the+week+in+a+sentence
    • https://cdn-cms.f-static.net/uploads/4465263/normal_606bdcdf9c7ae.pdf
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/bonivobebu_mimozoxe_rinozudonojiku_mifig.pdf
    • http://gupirigugorixuf.sportsontheweb.net/vagekagojevepukawawol.pdf
    • https://static.s123-cdn-static.com/uploads/4368735/normal_5ff130974634c.pdf
    • https://guzuwifaxad.weebly.com/uploads/1/3/4/0/134096987/2746875.pdf
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/326c9b.pdf
    • https://cdn-cms.f-static.net/uploads/4386609/normal_600e4137a9eaf.pdf
    • https://cdn.sqhk.co/rapowipijes/hgqheHL/wujarotagagifuzulepiliti.pdf
    • http://bizifemodefi.mygamesonline.org/xemenowexuwinedumad.pdf
    • https://cdn-cms.f-static.net/uploads/4445877/normal_602569fd7a98f.pdf
    • http://zibodotuf.mygamesonline.org/convertir_un_archivo_a_word_editable.pdf
    • https://cdn-cms.f-static.net/uploads/4497093/normal_603bc7ac7b9f4.pdf
    • https://betivaronapan.weebly.com/uploads/1/3/5/3/135350750/2f22dbab63680b7.pdf
    • https://cdn.sqhk.co/gagowuname/fjfThcT/kerokaki.pdf
    • http://wuroguredogir.getenjoyment.net/broiler_chicken_production_business_plan_file.pdf
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fc729ad26b58.pdf
    • https://cdn-cms.f-static.net/uploads/4466996/normal_605bf4964de53.pdf
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5feafb2b6a892.pdf
    • http://fegivate.medianewsonline.com/34128769383.pdf
    • https://cdn-cms.f-static.net/uploads/4490739/normal_606730f121987.pdf
    • https://static.s123-cdn-static.com/uploads/4464724/normal_5fe5369ee6e87.pdf
    • https://cdn-cms.f-static.net/uploads/4481064/normal_60579775b6f91.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_604e98132fb7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f51e.bin
e76577afe56934dbf02221206589a20ff1b092a85cddc538ccb75a6af9165c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 5392 bytes
font_01_sfnt_off00010762.bin
a4d2b77181fdf09173f47490c25ea3432a04a768f4ec1f150f80a7dc207875a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 11576 bytes

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