Malicious PDF — malware analysis report

Static analysis result for SHA-256 176e3e5158423eb9…

MALICIOUS

PDF

80.5 KB Created: 2021-10-05 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0356ee79fa042c456e99d131ff2f6f41 SHA-1: 27a8c55ed0dabe1fb88e5e9ff5022294028e9c33 SHA-256: 176e3e5158423eb90a4234c842931eb324a64569de659de53166d425051ff05b
126 Risk Score

Malware Insights

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

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a network designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://khautrangkhangviet.com/upload/img/files/26813546223.pdf In PDF document text
    • https://vinocastillo.hu/editor_up/87575231867.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/fupewamamaj.pdfIn PDF document text
    • http://riviera.az/userfiles/file/nizilovulugosowetafuri.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gatokanogatarizubir.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/bowubowidamitumivapubu.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/jawulaluturividowofewab.pdfIn PDF document text
    • http://martonelektro.hu/files/file/zuloxavope.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rorubimuzekuje.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/47510742404.pdfIn PDF document text
    • https://securitydm.com/slicice/file/manubokide.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202110010443565921.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/66808669410.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109220312013202.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nateguwogon.pdfIn PDF document text
    • http://0953057778.kad.tw/kads/ckfinder/userfiles/files/50743225739.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/wifejevipatu.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/narigozidofo.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/82418989788.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/45102915790.pdfIn PDF document text
    • http://sro52.ru/uploads/files/51135305766.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/mivag.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/sidolenazuxusub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=math+function+tablePDF 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_off0000d3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10396 bytes
SHA-256: 3a287eea710089d1be6adb5a75dc06f43e3bac4c27da997950dff453e5c7be88
font_02_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 19088 bytes
SHA-256: 6888ccaa9a366d5ac1fee5f0fa4a9712c0ad2fdbdf9474726cbaee05b90a966d

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