Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfb5f9644453ffc…

MALICIOUS

PDF

77.3 KB Created: 2021-09-09 12:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6bfa13f3acadd724b2a9ebe6dbba80e SHA-1: 54846947f63a805723e8e9672f33dab2d35778b1 SHA-256: edfb5f9644453ffc2e12bb3f69debd19ada9f5e1a66ddbfc4164882432623617
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with many pointing to disposable or unknown domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://piazzademarini3ge.com/userfiles/files/57500019488.pdf In PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/kexogimunemitimiki.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/fafefexilanagedegakusi.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/2444232041.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rukuzemiteguri.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/28053849231.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a9656f171---6491584318.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/37119136781.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/20049193523.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/34407616655.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/lakikalokusoraradisarinu.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/vuxipesexugobuxusufun.pdfIn PDF document text
    • https://hoongnau.com/upload/files/86605661388.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/dapupijamabadovunuribapug.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/nalujevopedarifebepaxeki.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/68398196041.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/11602650747.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/jikilegiliri.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/goxovebagoduwixatogek.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/76916933795.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/8045147434.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/kaberajajav.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130c57f57b48---fuxuzetumopibedas.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/16719928159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=subway+surfers+amsterdam+mod+apk+unlimited+moneyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b55c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB55C 17652 bytes
SHA-256: 1eb8debd27d1412377c1b6ba17f3bffc1c8cf9a0ee44287c2b5e45c6090fb60d
font_01_sfnt_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 14444 bytes
SHA-256: de9a1d37d154855e2bfa6a31fd5d50725873db8fd14edbf3cae457568c0ba344
font_02_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 11264 bytes
SHA-256: e9b693437cb938584b1dfe77d8226d882d9c5f1673910f2e385e86ca2c516c67