Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb58827bef51602…

MALICIOUS

PDF

78.0 KB Created: 2021-05-16 10:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 23fafb0f69b8be7fb87d539f0f53e5e9 SHA-1: e16e7eedceeb3a92ddcef386dfae6fb1eeca8119 SHA-256: 7cb58827bef516023168ebabcefdeb500d6ce77cd674abbd2cb26a9b51c2984e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • 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://maypoin.ru/strik?utm_term=applied+multivariate+statistics+for+the+social+sciences+pdf PDF link annotation
    • http://zamowafa.mywebcommunity.org/27104560573.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/86178455071.pdfIn PDF document text
    • https://masiwirisiniziz.weebly.com/uploads/1/3/1/4/131453333/kakagazadiros_rutas_japimarejuzax_pilalijifadod.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/65639465831.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/1373463.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486042/normal_60240665526c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_603b5c222690e.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/how_can_i_reorder_pages_in_a_file.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/crossword_answer_for_excessively_sentimental.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/xiwaxovufosaxuzibunisi.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/iso_27001_vs_27002.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/amma_bhagwan_images.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_6560c0dc2ee24d018a93ab98171d9e5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xokebore/amarnath_ice_lingam_formation.pdfIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_66985e9ccbb54623843af01148b57fcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/72830396714.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_6902c330f4824f18bb42d164dd7e1c75.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_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 5444 bytes
SHA-256: cb7a91284c2eb3e17f4105a4150d89df74cbc0b7c24a99e9bed06ce81b111f1d
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 10868 bytes
SHA-256: 4c2a7bad1a799241ec129104f0af50aeaee4e3065ab72faae0ab9c1d5ea5bfe4

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