Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2875d4e0fddd3b7…

MALICIOUS

PDF

92.1 KB Created: 2021-03-30 08:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dd3fcf901e3233b1bcefa3143b1985ad SHA-1: d88c5ffef84592e6a7690999c6cf397b0a8feb1b SHA-256: d2875d4e0fddd3b71210ff2fc03eaf88b1038b46bda054d078f49bff32ce01e4
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 are SEO-optimized, suggesting a link farm designed to attract traffic. One of the primary URLs, 'https://botokaw.ru/award?keyword=reversed+carnot+cycle+pdf', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://botokaw.ru/award?keyword=reversed+carnot+cycle+pdf PDF link annotation
    • http://vevufilusik.scienceontheweb.net/aula_internacional_1_libro_del_alumno.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/wujapu/constant_contact_template_tutorial.pdfIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_07b714f3012248fd93fc3a247ac5442d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/therapeutic_hypothermia_guidelines_aha.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/30857227695.pdfIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_020285410b2b4e2a95446798a15fec2a.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_7557c142a4f84bf9a52dcf1dc8233de3.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_b094dd4c993142b0974c49f77c45548b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/85014304856.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/honeywell_hcm350b_germ_free_cool_mist_humidifier_black_walmart.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/68590386675.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/59615131398.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/73135347678.pdfIn PDF document text
    • http://rikuworubit.myartsonline.com/27055403510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b747fac-3886-471f-89cb-01cd31606db5/oracion_del_espiritu_santo_juan_pablo_2.pdfIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_1b668f9d9371417aa5a85f623b3e1d2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cf68a04-2a99-4266-8987-3cb731079acd/61783557867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d44ef0a3-6250-4224-a9bd-440ca90c07c3/29173526429.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/34942906588.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/079d4b09-03a3-46fc-a5fd-6a427d5fa260/9219670480.pdfIn PDF document text
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_a4e5571bd27943fd99fc73ff8410317f.pdf?index=trueIn PDF document text
    • https://eda93683-a6ca-45e9-8056-ca7adea7f1dc.filesusr.com/ugd/d655db_4c027c607766405db262627ade39216e.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_4ced146844e8437da67d62714fc8692c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 5320 bytes
SHA-256: d610c5cf3b72b757486ca8acedd6a3ca2bed6c721e146d6d2107375c0ff2e163
font_01_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 12452 bytes
SHA-256: 2c32a76a98dadc14a94a04faa808b3e5a1c0e0298ce2dfb86a94ad44e8eb1c36
font_02_sfnt_off00014cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC5 16336 bytes
SHA-256: 9589ba086148556c13eb78545a9eaafe5bfeb5c356d96d29c609c25a60bc88d0

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