Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a65958a06625eb7…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 10:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a387626b151815539b0433fb173b1f1a SHA-1: 90e186191a38a8f840b87c00493abf3934f5f967 SHA-256: 4a65958a06625eb794a7a97a7844babdd70a3be8c7d9fb24cccf7828f471fe08
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 0.9993

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://ponafet.ru/award?keyword=simply+keto+cookbook+pdf PDF link annotation
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/pimiragijum-fagatibikun.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/4499830.pdfIn PDF document text
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/luxeforupe-vojakitagapol.pdfIn PDF document text
    • https://bovoladimuva.weebly.com/uploads/1/3/0/9/130970023/4134980.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/9143715.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/4699502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_603689f9414b9.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/3312452.pdfIn PDF document text
    • https://zafatuxowusetex.weebly.com/uploads/1/3/0/7/130739053/vuxidefofebaladopol.pdfIn PDF document text
    • https://gedotelebuguda.weebly.com/uploads/1/3/6/0/136050260/kujonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365586/normal_5fcaca06699be.pdfIn PDF document text
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/jipoz-natumina-jowisusezuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_6046bb1054041.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/laraduditozuxidek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_604bc97b7f16e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414166/normal_5ff619445fb89.pdfIn PDF document text
    • https://wisufomerimugil.weebly.com/uploads/1/3/4/0/134016782/muvogebozinuvan_zufunimelegu_vavifefejizuwi.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/e0a2c50f-2c91-40a6-b7a3-78b62ef3e147/82111698107.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/jet_engine_powerpoint_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cd95e1-54d5-4163-aae6-662df0cca249/computer_science_distilled_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/71555029600.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/gogisuzenifujanawefapek.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/zonozaripimitebelazev.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_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 5224 bytes
SHA-256: 0add53730c33d78ba340ccaf8a6e1e20f11dad595d5d55b056251e51e75c19ca
font_01_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 11444 bytes
SHA-256: a9e0e9490c1ed08a8cae0b5cae64fd31e4cfebeafd714ec662fa4b44dcfc8ab3