Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0211ef65e2a4982…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 17:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8e76574c41a08c84d9129b2f2cd4e994 SHA-1: 32b3ab5374fedc49b2d3fa31cbc1c4ea9a8e2f97 SHA-256: a0211ef65e2a4982a2bca9ab845c634a14c5286319777e8b3348cae473a5faa5
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the deceptive nature of these links, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 http://parikshitconstruction.com/uploads/9336257286.pdf In PDF document text
    • http://metrocars.london/survey/userfiles/files/8870786787.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/83112456767.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/93234329201.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca809d88a7---judodapapeko.pdfIn PDF document text
    • https://xenonsvjetla.com/files/76190783622.pdfIn PDF document text
    • http://fourfoods.com/images/files/dofapaboma.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/11629653350.pdfIn PDF document text
    • http://kbchina.de/upload/88133146065.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/46935213318.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/86985640235.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/75309996991.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
    • http://turatabor.hu/media/919632211.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/punasixivipaso.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/24414914801.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/nusikadojejofa.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2eee3e11c---59647396099.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210919_861CB491E5F5038B.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/46754231805.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/57682740166.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/dupanozadupa.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/benefubafaze.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/93282589352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=wpa+hacker+apkPDF 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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 9928 bytes
SHA-256: 01ac959a3027aef71a8d95feebc1463402b0e1e35b5d93eb8d790e6f8dd22d61
font_02_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 17840 bytes
SHA-256: 7fa2e929eb1157c65e3355b3f348d2d80166ad2dbdf8f5a38ae6d298b6f9491f