Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d9626be91d42f6d…

MALICIOUS

PDF

84.1 KB Created: 2021-06-13 10:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c04cd25b9d37b02170f481adbb5e42e4 SHA-1: 23c39b2297c74c211a5c6c64eb45543846e77d0a SHA-256: 2d9626be91d42f6d13ad0051c7b755681ceffaee50df4cd0b7bd7431e74ee8f6
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 0.9990

Heuristics 6

  • 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.
  • 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://allytemp.ru/pbw?utm_term=3+floor+house+design+images PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381788/normal_6060f69d79084.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4468831/normal_60b0008a04267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_60568b8d5be62.pdfIn PDF document text
    • https://nowitapa.weebly.com/uploads/1/3/1/4/131438176/biroxumit_bisaga.pdfIn PDF document text
    • https://simiwulizolur.weebly.com/uploads/1/3/1/4/131455232/0d94393c2a3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4497697/normal_60b3c9f04b9b3.pdfIn PDF document text
    • https://jukewamozaf.weebly.com/uploads/1/3/1/4/131438013/419c26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_604663afe4eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_6032630f09397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_6028be2e333a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_6045bb2d281b1.pdfIn PDF document text
    • https://ponitunol.weebly.com/uploads/1/3/4/7/134747778/rolitisiludujiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_60600d7aa9150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368250/normal_6062f6949ca8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_605de19091ae7.pdfIn PDF document text
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/tegabok_zipamina.pdfIn PDF document text
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/70840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5ff260275bc4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413345/normal_601d2290906eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486221/normal_5feafca4361aa.pdfIn PDF document text
    • https://voximaka.weebly.com/uploads/1/3/4/0/134017552/remugalalisasusibanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144437724/gta_4_psp_download_rom.pdfIn PDF document text
    • http://xugatun.pbworks.com/w/file/fetch/145007634/joker_full_movie_online.pdfIn PDF document text
    • http://jorowad.pbworks.com/f/77133385699.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/w/file/fetch/145117764/74960216486.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 5192 bytes
SHA-256: 9c2e6d4516995ec094ece29180e87b07fba871303e55d534636326572a59d278
font_01_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 11008 bytes
SHA-256: cc5bf3b7a7f7c8a559d3dc0026d79d50685a2c59e6688e1800dcb49cbddc7377
font_02_sfnt_off00013479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13479 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e