Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd66389db87986c7…

MALICIOUS

PDF

109.6 KB Created: 2021-09-10 14:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d18876f505683ce148e350187b51722 SHA-1: b4889400178f8ff6d804ce3493598fd5847474b7 SHA-256: fd66389db87986c79bc17aabcf42f5f2c5bfa98dea1305c12e42ecd6a320ef10
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it acts as a link farm and contains a lure for clipboard command execution. The presence of a visual download button further supports a phishing or social engineering attack. While no scripts were directly extracted, the overall behavior suggests an attempt to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • 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 http://olympusflights.com/files/files/33965790515.pdf In PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/90677143789.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/jipojosapo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/64796443915.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/915194266.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/56044655013.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wironajujemobi.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/zejiwefemujagiku.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/rejurijowepotumubewo.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/xivufonelojel.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/xaxodolosabavevowu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/joturelobanezagenunelex.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/duvevasilifapad.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/vofowiwokosejuxor.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/gebixekerikodebarenalazid.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/31551981317.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210910_100742_140.pdfIn PDF document text
    • http://posuni.com/userfiles/file/35675221542.pdfIn PDF document text
    • http://immopolignano.lu/images/fipinufopeta.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/13424020825.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/37f8c6139b22ec965a3a6b0fbebe1e98/kufat.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69751673843.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/lefovewojulojupuwami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iso+file+windows+10+64+bitPDF 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_off000141f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A07 10684 bytes
SHA-256: 06a5c61eac7f38afe0f1320d7ce82789f8728f4f36b402060e0001c185fc9f11
font_02_sfnt_off000172be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172BE 20284 bytes
SHA-256: 395bec7fdff82267096da89bad40dc373407d8414d9124a450616b935d41d16c