Malicious PDF — malware analysis report

Static analysis result for SHA-256 3825759ad081ae47…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 18:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fc2700876d4f162a0b6931b5d65eb4f SHA-1: 6ac43aba9273dc8a49072f7882eb3ebff25dc826 SHA-256: 3825759ad081ae4773d49ce5d0ac900148f1a91024c2ab913cbd3514198e94e9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, some of which are algorithmically generated and hosted on disposable domains. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or to download further payloads. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest a spearphishing attachment (T1566.001) designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mapect.com/upload/fckeditor/file/zatirorune.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/47674677928.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dopetuwazafizibimodij.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/dowelub.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/87864248364.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/bowumuzetodolomo.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/53499447925.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/61004629263.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/neranizodedutuletuwax.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/lemuduxodenuripibesuf.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/woxozebevi.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/pupulubefufodugonomo.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d85f2434---17538918040.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9299388945815c2e520c951aaaf39ed0/34399929258.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/25295128685.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/xasilogegetaxeborazowowur.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/80277118905.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/342567.pdfIn PDF document text
    • http://dfanchem.com/upload/files/fodozepifalokafenaz.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/12416454152.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/87649154752.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/suzetepod.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/82834664034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=extreme+suv+driving+simulator+mod+apk+hack+downloadPDF 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_off0000cd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 11388 bytes
SHA-256: efb4e390854d4c2eb6914129a8e86ece8cd652dce0388b14ace0bb93db233cb1
font_02_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 18244 bytes
SHA-256: 9a4ce6e35220a043832cf062dc7692de2e2784a5111960faae9acd28bc9d4e5e