Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d09aa87843d285…

MALICIOUS

PDF

75.9 KB Created: 2021-05-28 21:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: da7415d87ff28af4bb8146ce0506430e SHA-1: d7020f50a3bc6504c5c06edd74a8fbbba6939f13 SHA-256: 12d09aa87843d285c8b4582fd5f824ea73146c4d6aff2aa97505a1bf36bf0da6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wb?keyword=amelia%20bedelia%20chapter%20book%20reading%20level PDF link annotation
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/9332347.pdfIn PDF document text
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/8406897.pdfIn PDF document text
    • https://kowalarezanir.weebly.com/uploads/1/3/1/4/131438161/nigawidixutejez-rumatuzuluxojej-sufovaneje-zosarimopafa.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/wiredilomalinesan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_5fd63464b3ee8.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/3974244.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/1f152f2a7033.pdfIn PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/nazek-biwotuv-dowogen-dibexeluwi.pdfIn PDF document text
    • https://perufagumitaxa.weebly.com/uploads/1/3/0/7/130738779/lefenupezogajor_xokofuxabuvob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fd909e12a3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410432/normal_604d2111b1e94.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/eed283e294.pdfIn PDF document text
    • https://kutozeworefo.weebly.com/uploads/1/3/4/3/134306688/1432065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_601e944831de0.pdfIn PDF document text
    • https://zilifanaj.weebly.com/uploads/1/3/4/4/134444715/gepuxuxokotig-gotif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f8f6cedf1.pdfIn PDF document text
    • https://wapixetisabin.weebly.com/uploads/1/3/4/6/134685373/xasakofose.pdfIn PDF document text
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/xikoratul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d844106-4c8f-4ace-baac-254a0a31ca4d/57725825946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68c2a214-0abf-4112-a06a-f5dcddad0b6f/nordictrack_exp_2000i_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/719c2520-755c-4edf-baf2-e641a5e08275/esl_linking_words_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6002dc69-d466-4cf1-b13e-3c4eb82e8331/57353161312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb548ebc-ca81-48af-8932-e0e97d91e544/circumference_of_a_circle_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e83ea32-e8a7-4c4f-a05f-35a933d1878a/91535727616.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5564 bytes
SHA-256: 660d8a69d39efe8b6194c180243164f1b6b890f123ef91c99a2fb6a8579f5e6d
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 10616 bytes
SHA-256: 8811ece1bba8743059881b4cb8ca31e74bf84b6f57bdc793dde36a1ef49f0430