Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4199ba1973a870…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 11:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ed9da69541caf7c5333f1d644d30391d SHA-1: 20ed7e8fa46101fbf3092b4dfaab9c4d315e78af SHA-256: aa4199ba1973a870c5941a10a55d4adf8811aea5f5fd4d5cb708c6c64dc0f5b1
146 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDFs on disposable domains and potentially malicious IP addresses. This suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mobilaide.com/upload/editor/file/6573843912.pdf In PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16148c98112438---97776001896.pdfPDF link annotation
    • https://www.netcorp.hu/data/editorfile/tulorogosewi.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/15697203652.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/sixobasowudugigafo.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/95540641627.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/wenakizazuxixo.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gemiwikasopisa.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/46938487431.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/vopizufafonevoku.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/fakekizinajobo.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/gulasimorat.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/labesuzetawadafipufituwur.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/zoxiro.pdfIn PDF document text
    • http://eventechsite.com/files/files/64840719462.pdfIn PDF document text
    • https://lordoptika.hu/files/files/tibakebew.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/11395091464.pdfIn PDF document text
    • http://industrialdevices.in/uploads/9775896861.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/70910297328.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/41480380516.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/21766383547.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614804aca8a7e---26747939150.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/335ca9dc7996d83062bca58509cb6069/sozobexejosafubixibik.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/98953921741.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/19845437837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=navigare+in+incognito+su+androidPDF 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_off0000b8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 16680 bytes
SHA-256: db9fd8799d77153634883a0ddc5adf183cf9fd36ac1ae3dac657c1b92fcde492
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10644 bytes
SHA-256: a1a4bfefaeeaab5a965f356afea9d2f15e8f89b1d7aa4ca3dc19fd79c1277fb6