Malicious PDF — malware analysis report

Static analysis result for SHA-256 0477d0611adb0f11…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 05:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e01803478e95e56b0df87d431581a95 SHA-1: 216d0774793a403bc589d81bc649ecab48193224 SHA-256: 0477d0611adb0f11e0f0a7f7048b1f6cadb213b3324c82afe0bad39e22f7fb0f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, including one to an algorithmically-generated URL, indicating an attempt to redirect the user to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://cructi.ru/uplcv?utm_term=the+paranoid+schizophrenic PDF link annotation
    • http://www.contal-farmer.com/uploads/files/85212455924.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/tojomolo.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/11889870263.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vixaw.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/37219679014.pdfIn PDF document text
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/lokakakif.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/43023527065.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613417620b64f---tulazemodulebinoze.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/lamotemazakeluzuv.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/72468676359.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/zuvebaduvataruwuv.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/72852312825.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/94254586145.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/watebibumojapagofof.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/42354946634.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ti0pkvn02cvht5n8k9te96mmd3/vitakutusafire.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/8376548593.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/jovoxuxafenomimi.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_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 18200 bytes
SHA-256: 15e78a21ab69f9f14954e39c16c307bd07f92e9a64f1c689b2b6bc74338861c5
font_01_sfnt_off0001093d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10488 bytes
SHA-256: 5c53d0a28498d2ab7e33cdb1f3ec6cbf6e54b15fa0c57dc241370445d2a4ab3e

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