Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca9aaca17e40c1b…

MALICIOUS

PDF

72.1 KB Created: 2021-02-19 21:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d67f0cea0e2a200c7ba488e2d57572e1 SHA-1: c8244a56cb99401c9aaa315a4b014943dcb299bf SHA-256: 9ca9aaca17e40c1b13a2a32c4e9a08d0c89baff0549329d18537106169e911a2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://jacksth.ru/123?utm_term=is+there+a+filter+on+my+ice+maker', are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=is+there+a+filter+on+my+ice+maker PDF link annotation
    • http://femojel.iblogger.org/bapovagoxula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_601f5a1976ff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5fecef8f3aea7.pdfIn PDF document text
    • https://kijomexed.weebly.com/uploads/1/3/1/0/131069838/a42167c77092a.pdfIn PDF document text
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/sepetobevugem.pdfIn PDF document text
    • https://zomuguzilax.weebly.com/uploads/1/3/5/3/135327960/5df2abc3abadc.pdfIn PDF document text
    • https://raziliselew.weebly.com/uploads/1/3/2/6/132695443/7287680.pdfIn PDF document text
    • https://neloramobipetez.weebly.com/uploads/1/3/1/4/131407165/koligexiwag-lotez-newudari-dajabekakisatu.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/juroruzeju_sudagegupo.pdfIn PDF document text
    • https://pimuvetu.weebly.com/uploads/1/3/4/6/134635596/1380436.pdfIn PDF document text
    • https://pigijolewafa.weebly.com/uploads/1/3/4/2/134235355/1344890.pdfIn PDF document text
    • http://zirirukefup.22web.org/spanishdict_formal_affirmative_and_negative_commands.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/itv2_plus_one_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/information_systems_computer_applications_clep.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/37044379775.pdfIn PDF document text
    • http://vilewol.epizy.com/cyberghost_free_android.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 5224 bytes
SHA-256: 94943d1fde28879725f363e68749fe176e71506def0ddef61900bd0321fa115f
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 10176 bytes
SHA-256: 3d2063a13da5ede074a1f82a99a62661163f1624a29215570d1ef515b01c49e9

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