Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd1c184c68a6fd9…

MALICIOUS

PDF

66.3 KB Created: 2021-02-13 07:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e3d866cd903262fa95357f4b3f882877 SHA-1: d5acbafb5ccc4048bda0a442b10365fddf405548 SHA-256: 8dd1c184c68a6fd9b7ca26f2acba94d5aeb9903e02e20f162946690c19953063
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=happy+birthday+jasmine+cake PDF link annotation
    • https://cdn.sqhk.co/noperizapewo/h0iao6w/62554026131.pdfIn PDF document text
    • https://suxaniwaxunese.weebly.com/uploads/1/3/4/3/134385499/616189.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/hdhe8gg/lomuxawagaviwogovijolepo.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/Shchfhg/emergency_kit_earthquake_preparedness.pdfIn PDF document text
    • https://zobojosapez.weebly.com/uploads/1/3/1/4/131483592/f1ad13d8.pdfIn PDF document text
    • http://alcexpress3.xyz/955869664011l1v9.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/4556897.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/92a4af13885.pdfIn PDF document text
    • https://puxamosawakexa.weebly.com/uploads/1/3/1/3/131381243/4447398.pdfIn PDF document text
    • https://namatevugaveri.weebly.com/uploads/1/3/4/3/134350782/nazukazopajipinidin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://buwanizun.epizy.com/bakazilujuvawig.pdfIn PDF document text
    • http://gasigigi.rf.gd/89670959757.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/komegurifopulanar.pdfIn PDF document text
    • http://supetok.rf.gd/60080023910.pdfIn PDF document text
    • http://sevuvev.epizy.com/handlebar_moustache_trimming_guide.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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 5624 bytes
SHA-256: b27e0a04586bec8462d86ef3bb30d70b938c6c5b6ae20cbfcde66f9c2e0c0b96
font_01_sfnt_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 9348 bytes
SHA-256: 440adb0a4f01f6308e4cc27fe3c2a3be5d736082103195e3ed4fb9c3878d1737

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