Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6a5166da852a64…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 15:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a4543d4a7dbd92636bac9a67bdc4446 SHA-1: 9acbba32fdf7e46bf12140188c57367f2cc4ed69 SHA-256: ba6a5166da852a64692046c5cf92a5d6e08c1603821c972d29dfc0a87d2a296b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, coupled with a critical ClamAV detection for 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The ML classifier also flagged this PDF with high confidence. The document likely attempts to exploit users through phishing or by downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synowka.pl/galeria/file/2236097509.pdf In PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/53681825906.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/roxibeniwoge.pdfIn PDF document text
    • http://alptw.com/images/files/21578267413.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/feveginakavezo.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/41550482208.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfdc61255---nupedolovipugatodirifo.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/51275844035.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/20038489734.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/lofagedowajodazapoxavuwod.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/dukaradefikasuxa.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kunisalegimagelogazebojur.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/12996344189.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/60142463013.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109072033506843.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nezebanufimabufusa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5409c962374e46334bcb8d8a23e79218/54066454810.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/fakawoxato.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/wibajizixexonogevadesito.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/78549445285.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/lukosujaxigogalejawa.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/31200414402.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/639006218.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+convert+webpage+to+pdfPDF 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_off0000d3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F6 10772 bytes
SHA-256: 74080be845c3791f6203200d604001c218dc4ddb9e2d51c41b59e45c8694d8de
font_01_sfnt_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 16892 bytes
SHA-256: 17a53364a3f900ee0db129737d30919678860726b4bc7f287e50e5b105d501c9