Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc2493224e37da3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 18:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1fc940721a6687e7454a44a8e5ecdd9 SHA-1: 0a73be54e3219f2aae926f51aeb55ae9436bfbfa SHA-256: 8fc2493224e37da39f9baac5ff522d7f2539cc4ce2cb6e2aa8b5593f18434516
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://chcial.ru/uplcv?utm_term=autodata+android+apk PDF link annotation
    • https://twr1115.net/files/fckeditor/file/79120571236.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/78055090192.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/daxaj.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/70191020214.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/31867548365.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/73871209395.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/11787468878.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/11417269788.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/biwurijobigovux.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/vexuwufefepasemiwapoxerol.pdfIn PDF document text
    • https://quizai.com/uploads/files/bisedadafebijuk.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/79462658090.pdfIn PDF document text
    • https://biomisszio.hu/tmp/77785033888.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/94738394778.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/pogasovukuvekamokupi.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/88592151343.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/semubosemox.pdfIn PDF document text
    • https://renault-service.com/userfiles/49214462642.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/rebotojode.pdfIn PDF document text
    • https://stopserv.ru/files/file/33177811112.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/88053240968.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/wosukuvaxizener.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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 18536 bytes
SHA-256: ec97f5b2a32058c0f2856469537b80d62ac2d4b442f12efab11bf2b02e1aaa49
font_02_sfnt_off000128a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A8 10212 bytes
SHA-256: fc3a3b1626c6e6b43c3492bade577328fcb9d00ed6f2adfd19d8a1922829c534

Open this report in the interactive analyzer, or submit your own file for analysis.