Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed5cd7159b876b9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-26 10:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 17046c2c2ba62e7008fd8b5d84fde32b SHA-1: 52ab5a098ae2f8d49f0470f7e9c12809326ef52e SHA-256: 6ed5cd7159b876b9e69e661d216cb281297b8a48e3e7dd8d46d4ca4839e595c2
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of malicious activity, including malformed streams and a high ML classifier score. It contains numerous external links, suggesting a link farm or phishing attempt, with one URL pointing to zajinet.ru. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. No scripts were extracted, but the PDF structure itself is indicative of an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://zajinet.ru/wix?keyword=i2c+vs+spi+speed PDF link annotation
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/83d18a.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/domain_driven_design_eric_evans.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/vokubazinemonexulo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5fcbac2f402e6.pdfIn PDF document text
    • http://fedezin.scienceontheweb.net/why_is_my_epson_printer_not_connecting.pdfIn PDF document text
    • https://kixakusafi.weebly.com/uploads/1/3/4/8/134891224/2728769.pdfIn PDF document text
    • https://sozusodugalonus.weebly.com/uploads/1/3/4/6/134614171/1961933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_604cfd2aae23d.pdfIn PDF document text
    • https://vemosesagegedow.weebly.com/uploads/1/3/4/3/134312783/sexamafup.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/lezopobigeza/2005_cadillac_cts_transmission_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/25480085783.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/jagorotadozaju.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_b47ff0dfab384458a57a12a0e47761fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/small_log_cabin_kit_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/93773523906.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_b7d6cca628b9431f9227ad7e52ce3d76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b539f-583f-4f3b-b073-40c2fd7f16a2/pusabelabokodiwalabux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4744e4c4-25fe-4c7c-aa2b-71a70f28e083/28761145539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d00f4c8-0056-4c97-b5c5-9835797384c3/rabbit_hole_bourbon_price.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/baby_boss_theme_android.pdfIn 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_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 4860 bytes
SHA-256: 7f5b8e76c653d5f4a887369b8796eae1a7059ea6e6e85cf7f8d980ba30487e38
font_01_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10656 bytes
SHA-256: f22a10dfb8bc0ef2c58e1b928e85e907ca3cc70989cc069fd6037f737faf3f2a

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