Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2b095783212381…

MALICIOUS

PDF

95.7 KB Created: 2021-09-20 19:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d47d1dc7b558645e2d2b4d7c53ff1ac4 SHA-1: 2b581bae3541db065682ea84fd48acd5d270952b SHA-256: 8d2b0957832123816908b83f895fbcd484dd2285b3277456aba8c83268e76421
174 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and presents a download button lure, instructing the user to open a password-protected archive. This suggests a phishing or social engineering attack designed to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k51s4h2on5hbhagg6kk0nktm3r/gotulujevuxosibakadowexiz.pdf In PDF document text
    • http://mail-business.ru/uploads/file/27209087563.pdfIn PDF document text
    • http://ewtch.com/upload/files/wuvoritororevarisukuwugid.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/mopunoraregazefudo.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/90276148418.pdfIn PDF document text
    • https://nexusmediation.nl/files/domevafugefemuto.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/87796807632.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/xoxawuvesorizavigagat.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/mepalesagikowagal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306926a5778---zizasenuxufarekovanazot.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/18802195719.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/98567174350.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/05220356247.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210919101318.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/63990745299.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/91413474073.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/lujigaxu.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210918193835.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/xuwere.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/17265475331.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/94206946742.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210902124705.pdfIn PDF document text
    • https://datenglagi.com/contents/files/mirirepimitamaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=jumpstart+and+dumpper+hack+wifi+2020PDF 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_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 20256 bytes
SHA-256: 7aa0e019d6739e077277845643c896fc571e834ae76992f53ac65b41a2066d85
font_01_sfnt_off00013e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A2 11228 bytes
SHA-256: 48738d4b09a3eb888d241e321630b0edb138733364964ff482e9d3a4da1b1433