Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbfb7d47b5834db…

MALICIOUS

PDF

103.0 KB Created: 2021-09-23 02:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80d122b71fa493717ea0d1be8b21fb1f SHA-1: 652a1f10a02f733c3352294f7d42e43dc77ced0d SHA-256: efbfb7d47b5834db466e6fd2f5ffa721b8bbf286a5afacc47f6bc5685fdd2543
194 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The document's content, indicated by the 'SE_SECRET_RECOVERY_LURE' heuristic, attempts to trick users into revealing sensitive information like private keys or backup codes, likely to facilitate further compromise or theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+hack+messenger+in+ios PDF link annotation
    • https://valve-toho.com/userfiles/file/jutabidi.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/69012382091.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/85380355789.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03933d2fc---80102636479.pdfIn PDF document text
    • http://gr-chem.com/upload/files/50576371332.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/84485600090.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/wobasexuzofanutanepatol.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59542938826.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631304020.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/tuserux.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/32335uvtsre1b2bf7dgu63s652/41402627971.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/19450894939.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/gojubukinefataresubigodin.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zitujavisewix.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/panumoxinodesavibezaxomen.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/3122801442.pdfIn PDF document text
    • http://kelsenator.com/userimages/78116768903.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/mirasexelizuxoruno.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/85490642200.pdfIn PDF document text
    • http://e-district.org/userfiles/file/20929355556.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/52094361971.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/15096806275.pdfIn PDF document text
    • http://ladna.pl/user_images/file/raxusu.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/zuxuzojulijagopa.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109110405413165.pdfIn PDF document text
    • 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_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10800 bytes
SHA-256: d135e460a3f3681062d7ba8ae785bd0adae94522a63bca6b96c7a841dd43f326
font_01_sfnt_off0001451b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451B 19044 bytes
SHA-256: dc7a9b38a7c78f9c17e62580031be6b3736a8af04bcc3db6434b4137737ff524
font_02_sfnt_off000176dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1