Malicious PDF — malware analysis report

Static analysis result for SHA-256 43bec922e508cac4…

MALICIOUS

PDF

76.9 KB Created: 2021-01-06 14:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 544431c425b7d0ef82f7f6567cc11fb8 SHA-1: d18f257083077e4a61bb164eb40894ea699998f4 SHA-256: 43bec922e508cac4ddf62ce54f904ba05b2cc1a775f7f5b2a0dcea26671711e8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to disposable domains, identified as a link farm. This technique is often used to manipulate search engine results or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=new+iowa+hawkeye+basketball+uniforms PDF link annotation
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/1a1406fb6a.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/6986705.pdfIn PDF document text
    • https://buvurowu.weebly.com/uploads/1/3/4/6/134638295/buvisav_pajazijenudu_fibosex_bekunef.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/gijoz-vureranar-mesedexaju.pdfIn PDF document text
    • https://bibatuzasofobi.weebly.com/uploads/1/3/4/8/134879938/gutevolix.pdfIn PDF document text
    • https://kexekogu.weebly.com/uploads/1/3/1/3/131384418/bezusarifademuwubi.pdfIn PDF document text
    • https://lipojiwogim.weebly.com/uploads/1/3/0/7/130776075/panezano.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.pdfIn PDF document text
    • https://fanedidunosav.weebly.com/uploads/1/3/5/3/135345804/magonarunudobinalup.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/xatonokax-futowoguxubuze.pdfIn PDF document text
    • https://kuzeloxowew.weebly.com/uploads/1/3/4/3/134330257/tisowir_bozilexamalir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_5fb5369bc94dd.pdfIn PDF document text
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/zefaxuxitem.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/jimipatalag-fajarowagaleb.pdfIn PDF document text
    • https://domuzowejiro.weebly.com/uploads/1/3/4/3/134360268/8423172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/123f2f20-a10b-4ab5-a4e4-e5248b885215/61786912258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80570549-766b-4a6e-b8c7-d9bc32b13cbb/92839145210.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 5256 bytes
SHA-256: e4f1ed786705c30300a258950c34d75c37e166801c3500ea8e09ae5a3032c843
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 10904 bytes
SHA-256: bb89a3997d52fef5f1bf24d535d969e44903783ec94ecbb8d88ce0fc8c3688fd
font_02_sfnt_off00011862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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