Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd090f9fc18d292…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 14:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 924e9d29984c77ba717770f3233d1707 SHA-1: a880ef0c9d1f9fc706c75bb5240c78c62cbd026e SHA-256: afd090f9fc18d29203ceaa11661cf484dfb99966410d3ed6108d870659b8ff3d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the document. The overall structure and numerous links are characteristic of a spearphishing attachment (T1566.001) designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://plantessentialoil.com/upload/files/wofizadokumemu.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/90958592325.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/53414883152.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/jubuwifininetozuvibemat.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/24905579551.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/jolevo.pdfIn PDF document text
    • http://rideco.hu/upload/file/gepuguwipuxir.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/wumodonipanezof.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/dujokofafobimotunejar.pdfIn PDF document text
    • http://effektfilm.de/files/file/64863465737.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/nujiwoguzadibiwuvosesije.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/nitowipa.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/20703741345.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/89774561538.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/punonuzupuzosijujikata.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/76993026742.pdfIn PDF document text
    • http://mastervin.ru/files/file/89609821597.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/patudikokefipowerel.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/22913874891.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/suzatawufafisowosatiwi.pdfIn PDF document text
    • https://badrivishal.com/media/lugetekumafigiwegedufoloj.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/jezigubidukefoduxif.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/10748635421.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb5d13523---96027136792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=movie+title+wheel+of+fortune+3+wordsPDF 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_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10708 bytes
SHA-256: 51d135b4e1146826e5d111d64342b367159e522afbf1bf5632692b67adbc120d
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 17972 bytes
SHA-256: caf09efe8e14967a619052f0dd84cb5efc39ef32c8e58f004ee7fdeb01f336b6