Malicious PDF — malware analysis report

Static analysis result for SHA-256 4486c7a3a018a97c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-11 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad078ed568fa6c34e87e7e0ed78b41b2 SHA-1: fd8cbedd6c0aeb656f97c80d04fe6de10da82b52 SHA-256: 4486c7a3a018a97cc85db0fb249783a4f7a7875548efccf01ff15b790f553c20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It functions as a link farm, directing users to numerous external PDF files hosted on various domains. The primary purpose appears to be SEO poisoning or distributing further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lamorenj.com/userfiles/file/74910507965.pdf In PDF document text
    • https://autoroman-service.ro/imagini_ws/vifikasedamik.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zigasutisele.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/54184459619.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/95121601746.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/38873174277.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5935451499.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/lewasepazevitebewuxow.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057c030653---17203324158.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/74108813222.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/dibav.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/8379284247.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210902172608.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/49955477276.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/59756444345.pdfIn PDF document text
    • http://kustari.net/userfiles/file/96356851848.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/zanumojimapaverigenivo.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/17374266519.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/bofituvogimajiloxetoni.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qcgk5hr5k9lcefg7ergdndtm0/55170879826.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/perorujijomesazupo.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/8000503276.pdfIn PDF document text
    • https://equalland.com/uploads/File/85229857106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=assassin%27s+creed+valhalla+art+book+pdfPDF link annotation
    • 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://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_off0000e0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 11028 bytes
SHA-256: 4559db532a64cdbf79f99bb51290a24e40a3661664a1011b15444aef02430870
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 18260 bytes
SHA-256: 53b91d92526f48a9ad15484334f9a110124eada1f2213894ddb0c46c04e8a347
font_02_sfnt_off00012a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1