Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34c09d94b5570d9…

MALICIOUS

PDF

82.1 KB Created: 2021-02-24 13:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9a4db094f0054fc3419eed179251acca SHA-1: 2f1627e6253ccf2ab3982f2e4919850cdd0c58e2 SHA-256: c34c09d94b5570d95852af3a83d0b2aecc1c2a62ead9a5f74225b348b6c86713
186 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. 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 0.9997

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://jottigo.ru/strik?utm_term=car+wash+maintenance+checklist PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466151/normal_5fcf40ec88608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_600fccd041216.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/ja7geY3/80907519533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5fd7d981e8932.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/7145343.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/aUG7Ef9/85253373593.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fdb77f07ef56.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/FB9ghEF/sifinixakori.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/iwhiEjj/18861113572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470825/normal_5ff7f119183f1.pdfIn PDF document text
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/kesesagibazug-pogaxere-rafusotikegox.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/I1Agiij/78446197243.pdfIn PDF document text
    • http://megarafulosibef.22web.org/invite_meeting_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_60301fa7acd5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff7d18ed1f78.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/g59Qr2H/awesome_tanks_2_hacked_unblocked_66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369150/normal_5ffe21528a9bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viziboxovuw.rf.gd/85811006992.pdfIn PDF document text
    • http://ridezajumoso.epizy.com/pegidi.pdfIn PDF document text
    • http://boparozib.rf.gd/moon_good_night_quotes.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_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 5100 bytes
SHA-256: ef5955060ca283d9fa9ea3826c34d9bad6a645584636eb93b917eddcceb0a5af
font_01_sfnt_off00011554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11554 11004 bytes
SHA-256: 24bad1155174635d9fd78fd48291ef043dda7b3e161227bd50ba546ca6e25279

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