Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf89c63ffe9bb65…

MALICIOUS

PDF

80.9 KB Created: 2021-04-23 05:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0c9a5fa4e04bfe9efe5afd404efc97ff SHA-1: 59ff6a6bd975c16b86fd834f7f9173c6f52414e8 SHA-256: fdf89c63ffe9bb65e48db331beb82737e43eab4f16c844d77ce20f6a79e8af80
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://fokemale.ru/strik?utm_term=how+to+fix+a+leaking+kenmore+ice+maker', are likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fokemale.ru/strik?utm_term=how+to+fix+a+leaking+kenmore+ice+maker PDF link annotation
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/4677594.pdfIn PDF document text
    • http://gadatoreneperil.mygamesonline.org/bipam.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/2342579.pdfIn PDF document text
    • http://item-get.top/wing_chun_18_hand_techniquesmvqz8.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/patofisiologi_abortus.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/23356376392.pdfIn PDF document text
    • https://zanebereraba.weebly.com/uploads/1/3/4/4/134472179/nagusasujarim.pdfIn PDF document text
    • http://sdfafq.info/golusimf86nd.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/silura_navobas_gubif_puxazonedos.pdfIn PDF document text
    • https://taboloralo.weebly.com/uploads/1/3/2/7/132741194/6c3a47b181d8642.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/how_to_start_dental_assisting_school.pdfIn PDF document text
    • http://linunewilut.mywebcommunity.org/common_sense_test.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/5230296.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/72030759050d87z6.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/bofazojut_lavew.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/7745488.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/pizikipuxoxodumiwemailoud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xufolat.atwebpages.com/pifofagidejirizalerux.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/animorphs_book_21.pdfIn PDF document text
    • http://kegigija.atwebpages.com/pekurijoza.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_6589f11e3e35477b8bdb14d9df97b6c0.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_e9361ca233ad4f73adf91db8cc2a43de.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 5208 bytes
SHA-256: cc42b711c02b39058769bce2ec7957c1fc765e83b113c43fb3ecb761c58bac82
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10936 bytes
SHA-256: e4650bfb624f0187225adf7231bc38f05a4d5629745db613b06c04631e4835f9
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16808 bytes
SHA-256: 84f1297c9a2b70ac378927f7465366ab14f08c21fa0e2450beb6bae2fdc80ed9