Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ffbadfe5bb4b34…

MALICIOUS

PDF

68.3 KB Created: 2021-09-19 06:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1178e59987b302652a90e23034e6e6e SHA-1: b577539f280533cc2b6013efe67f25377cbc0175 SHA-256: 84ffbadfe5bb4b344a8e445479df0d397a809bc6c6a869356c383deae6a9a889
146 Risk Score

Malware Insights

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

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based interface designed to trick users into clicking a link, which likely leads to the download of further malicious content. The document body is heavily obfuscated and contains no readable text, indicating it is not intended for user interaction beyond clicking the embedded link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://xn--nmqu14inmf.com/upload/files/48897536787.pdf In PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/29289880055.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109090655062931.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/tumumopowurezulififabum.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mb7gco3e0no9g6qt0k1qq0jria/19868401806.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/pexifi.pdfIn PDF document text
    • http://airmon.hu/images/files/1227994849.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/pusewinerikedesipogufa.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/59184917743.pdfIn PDF document text
    • https://tigapilar.com/upload/files/99828955464.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/nexobikak.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/wabibiz.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/lurivoxasix.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/64399962058.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/lurevosos.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/jodoxutisobox.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/41010759539.pdfIn PDF document text
    • https://alkoplast.rs/files/31356007423.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4054161492.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/fibasavew.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/45968536825.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/98294594393.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/xigepusun.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/jejixerajinab.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=zenonia+4+hack+apkPDF 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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 14228 bytes
SHA-256: c865aba2c9937b0f669618b3deb25e5fb881911205ea71b0cf7ded753de550a4
font_01_sfnt_off0000d37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37C 10192 bytes
SHA-256: 075eaaa3731f4f27eb614214b4f20ee7c6c224368d4be346c06187e9c96a0614
font_02_sfnt_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1