Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55bcc951847dfd5…

MALICIOUS

PDF

82.2 KB Created: 2021-03-18 15:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d84b284772ed804bb41a87db3bf42ac1 SHA-1: ebe0a2ce658db072bbd0e8820d2c701ce7b1dfc8 SHA-256: c55bcc951847dfd5c8fffa4dd323b4eea8b2c7b678983145e4f1b47cd4cfa03c
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 appear to be part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to potentially harmful content.

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://soxebez.ru/award?keyword=coffee+table+book+ideas+pdf
    • https://fibarivinudew.weebly.com/uploads/1/3/5/3/135387866/wanezuwugakubo-sapoxapazulez-rexidejuxusiv-vuwadil.pdf
    • https://cdn.sqhk.co/gasowifozil/ZEvvwvZ/crowd_city_3d_download.pdf
    • https://kivomulugan.weebly.com/uploads/1/3/2/6/132695939/pobef.pdf
    • https://widijusadapabi.weebly.com/uploads/1/3/0/9/130969823/wugepokewebo.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/vizipirizugupu.pdf
    • https://romuxejis.weebly.com/uploads/1/3/4/8/134887308/fusejutega.pdf
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/48533.pdf
    • http://vukabakoxipus.22web.org/jopejuxagepotebojav.pdf
    • https://cdn.sqhk.co/puzokopu/hdigxhf/67610438713.pdf
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/farexerurewiw.pdf
    • http://tuduvodakep.mypressonline.com/microsoft_technology_associate_mta_database_fundamentals_sql_certification.pdf
    • https://lorinifufa.weebly.com/uploads/1/3/4/3/134357706/legiwoz.pdf
    • http://zitukuzagipu.iblogger.org/52160584910.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bufirapopedodo.rf.gd/gyproc_plasterboard_technical_data_sheet.pdf
    • https://s3.amazonaws.com/belapawerezuju/92352593168.pdf
    • http://wufikemofumop.atwebpages.com/95_ranger_bed_size.pdf
    • http://gajamozaxekega.atwebpages.com/pathogenesis_of_methicillin_resistant_staphylococcus_aureus_infection.pdf
    • https://s3.amazonaws.com/vobuturinivi/xinenadopeb.pdf
    • https://s3.amazonaws.com/wusone/high_bass_boosted_music.pdf
    • http://bafuwujix.atwebpages.com/5605098948.pdf
    • http://kubomefewofumim.atwebpages.com/what_education_do_you_need_to_be_in_the_military.pdf
    • https://s3.amazonaws.com/wuwabobujasivor/80252423181.pdf
    • 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_off00010589.bin
5862044fb0c8118e0baff181b0ce9dc728a014f82b6469c84af45a128650ba66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10589 5048 bytes
font_01_sfnt_off000116c0.bin
3bd7df0a97cee11a7e446b082b3a5798e00c52e5e7c7867eef6fb248fe36fd5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 10720 bytes

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