Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc6814341153ab9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 11:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d1de54e3366947c226e46576e93c96b SHA-1: 84786eb2d9b29860e05075485447a4fffe82e5d5 SHA-256: cfc6814341153ab90a10da66d05c025e7bac04c4343320b8c87269f720d8ec0a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF contains embedded JavaScript and external URIs, including one pointing to a raw IP address, indicating a malicious intent to download and execute a payload. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan. The presence of a download button lure further reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.adoz.cz/ckfinder/userfiles/files/lodoke.pdf In PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/lolotomumitazelododa.pdfIn PDF document text
    • https://cubic.is/userfiles/file/kesatodiredenijelasozosol.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/65771615942.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/turivitojareb.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/7040252024.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/gokujutid.pdfIn PDF document text
    • http://greenld.com/userfiles/65009451858.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/xudugeduvamomabat.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/tominesixabumixowasigise.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12e2d0ffc---bulexilod.pdfPDF link annotation
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137b1a7f1b82---62351112245.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/99422592322.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/73158413582.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/sovigupizirosu.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/75847204473.pdfIn PDF document text
    • https://123natura.com/stockages/files/11036260374.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kijonupidixebakajozazaxew.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/74478335476.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109071346226405.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/rekujasobosa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff11ab7ce---pajosaponudibu.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/zosinifabo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/nixunulebojitemez.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/sasijazede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+smackdown+pain+for+android+ppssppPDF 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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10728 bytes
SHA-256: 8e73bfe5561f6ef51d1ae96625bc8ea8f5457cbb6856c16e2fbf508fc612be96
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 18080 bytes
SHA-256: dea5629bf50a079d8c30f435e18e569700d81febbae4d80342c644553093cbd5
font_02_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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