Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb404e5e9b8798c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-12 20:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90271a52060c5e9030267a7742046fd6 SHA-1: 58638abb18f5748ae85115cd56aeb50514228eb6 SHA-256: 8cb404e5e9b8798c52bf8b07428d5e1c61ad2e06b1b45dc2e3d5b74a0514de34
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host many links on low-reputation domains. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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 https://infrive.ru/uplcv?utm_term=pocket+academy+apk+download PDF link annotation
    • http://zuszdounky.cz/files/xobuluwugokogigisape.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zupefolegu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/rerezameles.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/wiwikotosutilevunosegulop.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/89516848205.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/4282340151.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wezorakelotuvov.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/40567291775.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/lajife.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/45406194256.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/tiwinuxiponaniz.pdfIn PDF document text
    • https://hobbypet.cz/files/file/50143678765.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/luzud.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/47665828248.pdfIn PDF document text
    • https://unaizahic.com/Files/files/xidiravasilalobigi.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/64405868975.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/puguluboditasodaxit.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/3225393760.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/xenekoju.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/96405795607.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/84527764682.pdfIn 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://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_off0000bb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36A 10608 bytes
SHA-256: 194c5e8fdb7185aad628960c4a810db2cc7f358611a23731eb104da3b3943740
font_02_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16892 bytes
SHA-256: 157c27ba08d61777ccc5d11db1146b033fcfb8dbbbd35aeee2200680aed10547

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