Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ce71e1f3a5d2b5…

MALICIOUS

PDF

87.2 KB Created: 2021-09-20 09:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff2c0acb135dc38562b8db8faca74b86 SHA-1: 4f33b60710a4f616fbc41fa3b951cb5d469e4635 SHA-256: b4ce71e1f3a5d2b5e8e86df76cd0d3eacedd22da78bf83ab898e5187a979c8da
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying a 'link farm' on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a6f3e439---kimuvisarafu.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/62193963221.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/jabakisebosarejekepelisug.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/nodijazuxifoxaridum.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/43759725451.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210909100303.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/48418944902.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/64249787834.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/tivobikowapaligifog.pdfIn PDF document text
    • https://ms02bet.net/contents/files/nonitoni.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/20099206856.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/velelevelo.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/gutiladiniwojasiw.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/litapepebamazoporuki.pdfIn PDF document text
    • https://toocapen.com/files/beliw.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/2269252565.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36515801845.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/72937848916.pdfIn PDF document text
    • http://domexpo.ru/up/file/8092518946.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/gatibidazimijiwub.pdfIn PDF document text
    • https://bak.vn/upload/files/64994023583.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/ranevajutanegigirivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+get+toolbar+heightPDF 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_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 18832 bytes
SHA-256: b75e91da6c69fbc837eba6238b1feb17c2e788acd9258655d7164bc9fb3f3b32
font_01_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 10480 bytes
SHA-256: 02eff8b576af7a564571cdc4dd393416cf7c3a62c044bdf84283fb7dad1589e0
font_02_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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