Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f440a93ef7b3605…

MALICIOUS

PDF

91.6 KB Created: 2021-09-15 18:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b954becbc99c95be5e6e91f251ec8bec SHA-1: d9e615fa1f7c9c42eda6ea7aea89d7a694b7edca SHA-256: 2f440a93ef7b3605eb76f4d3a0fa6bdf15d151b37d4009c4f2673279af7c31d1
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and heuristics indicate it impersonates a cloud document sharing service with a call-to-action button, suggesting a phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent to trick the user into downloading a payload. The presence of external URIs, some pointing to potentially disposable domains, reinforces the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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 http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/41259394556.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/bofumizarudipogore.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/fodafewezuseminupoviwi.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/13597443862.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/gavozodijasowubegexarel.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/25535974277.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01456ec127f4cfcb166637e4bb58c514/98907959481.pdfIn PDF document text
    • http://tcihk.com/userfiles/lopufodolikixemapamoj.pdfIn PDF document text
    • https://o-dance.com/upload/files/rovujuf.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/72336749121.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/ximawa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901095758.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/luwepija.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/72897616275.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/9083628323.pdfIn PDF document text
    • http://newworldss.com/uploads/file/lavuzejiwaxijuroruwazaru.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f10c7241---93222748672.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/votegevazofu.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/39854265720.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/mudogejabasadar.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/37583356687.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/pibigafazofiraxigufegired.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=convert+pdf+ppt+to+ppt+onlinePDF 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_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 19204 bytes
SHA-256: 6379f40ebbb44cbf84f14e3726786aafd73aa33f4e42e6f8a8cc32d9180bcfca
font_02_sfnt_off00014a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A37 10260 bytes
SHA-256: 0ab5a47dfa689818e4a52ca55af9b2cf19b5df769bab5b628dc2721106017822