Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84a3079dd33d279…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 03:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 15f06395f4ce59db1c55a5ac6c30ce3f SHA-1: 4427ca452cbe95a1de570ca5ee5db114921f2294 SHA-256: e84a3079dd33d279a00a0c4224aace6a0008fc4333e13b3f24bf0d60326216af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, indicating a potential phishing or malware distribution scheme. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://derya.afmiletisimajansi.info/resimler/files/refopekurazigoxesalu.pdf In PDF document text
    • http://dynamic1984.com/user_file/file/kiwemuwunis.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nufufewegazutepujalazajem.pdfIn PDF document text
    • http://airzo.net/userData/board/file/kewinikudekavibopovonodim.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kesujid.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/12071491518.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/59749091223.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/juvax.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/92860928350.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/wibewasegisor.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dovalojofemur.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/35920504415.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/lojizojosexe.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/xadatolivuwunowizovoke.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/wiseniwakoxuwemasuwof.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466e25ca3db---31111509662.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/63415133513.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rarexabujex.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a6b0a79c708f7630d001360d3d996177/zesakaxememogiworesul.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161413eb5a8404---zazakapamojikeguxurow.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/kilubojamapataxajejike.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pepawepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watch+drive+angry+online+free+123moviesPDF 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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 17844 bytes
SHA-256: a2c420458324f46377f91c8731d6b725c4073f06c16e17bd23c09e0767d48645
font_01_sfnt_off0001084d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 11440 bytes
SHA-256: cf2d9951d8eb4ec7a09f2c6395407453fe05485a3c45f170af4d82ba1c0cc957
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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