Malicious PDF — malware analysis report

Static analysis result for SHA-256 6368b69e23fc7102…

MALICIOUS

PDF

74.6 KB Created: 2021-03-21 23:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0ae78e1995529fd3a58a8e5a3ee43af3 SHA-1: 13bd74661b53465d12f2d082451df66506939e21 SHA-256: 6368b69e23fc7102f2d0338951a457975bcfc974399bcc65c44c0e5d5a6ac0f5
216 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses brand-impersonation credential phishing. 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 0.9992

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://gukapubukon.weebly.com/uploads/1/3/4/1/134108909/juzukime-dixud-tesulo.pdf.
  • 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://maypoin.ru/aws?utm_term=what+are+the+elements+of+formal+writing+style PDF link annotation
    • https://gukapubukon.weebly.com/uploads/1/3/4/1/134108909/juzukime-dixud-tesulo.pdfIn PDF document text
    • https://cdn.sqhk.co/kevapaboxer/ghii5ji/94984082926.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/zujufozewujo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_6004fb11af0b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416322/normal_5fc60ab8be491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fffd3486987d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5ffc36dd9fbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_601837d44dfe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447466/normal_600842cd10695.pdfIn PDF document text
    • https://lumevukivejus.weebly.com/uploads/1/3/0/8/130874583/49c5d5060b43784.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413835/normal_5fc6aa38ba6ca.pdfIn PDF document text
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/b94fa23a7985c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488582/normal_60399a6bb8a13.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/QjaXijt/dafuzil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_600668837af35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404980/normal_6054dd9d9bc97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_6032642668ae3.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/kaxusufa.pdfIn PDF document text
    • http://wobixoka.66ghz.com/gijagobapekafazider.pdfIn PDF document text
    • http://mipasotul.22web.org/9433202320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debalipusafuj.epizy.com/perdido_street_station_audiobook.pdfIn PDF document text
    • http://xuxedawijepi.rf.gd/xuxerakifiperokuram.pdfIn PDF document text
    • http://barajolu.rf.gd/the_hound_of_the_baskervilles_movie_1978.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5388 bytes
SHA-256: 1dea68abb04b6bc9ed1dbfe09d3f987ad157cdb0a4148f8d95ca1148a3bd633f
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10784 bytes
SHA-256: 7fed63f633b4b164b81866e60fbddc35ef37ccee86212551786fffb887b2fa0b

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