Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabbe82af4060500…

MALICIOUS

PDF

68.2 KB Created: 2021-09-29 08:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 18969b22dffec4fbee3ee309190d96d9 SHA-1: 038011e79e605073aae5ce0e2fd60a971f29c13b SHA-256: cabbe82af4060500a3e8de921054143c0c60a4c41013375e606a3a733fb5a6a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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.
  • 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://laborke.ru/uplcv?utm_term=airpin+app+for+android PDF link annotation
    • http://ngocphuocjsc.com/public/default/ckeditor/files/jobod.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/lupopixinadovidi.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210922_062022.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/kiwimakavoduzux.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/30168453987.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/73991604421.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/64367754561.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/delawib.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161525558c4dd7---nuser.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/97106081787.pdfIn PDF document text
    • http://budka39.ru/files/pufobakerevafuw.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/pobizewaku.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/11125563489.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/xilurirexuze.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/95763910711.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/80308290814.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/11149512234.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/dawigoroxot.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84144910391.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/rimotutakovuxodikewapo.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vofoxitaxalijepoxoronako.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/84715882742.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/varugufoja.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/vefulaw.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/bemusesopalob.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_off0000af65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10028 bytes
SHA-256: bbed60b13d7789671d885a39fbd282d65072e2775fa158f89196ffb5ed5af297
font_02_sfnt_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 14980 bytes
SHA-256: 811bc53266bf956c411477d94c3f3120bf34221d2e5bb338869bd0a606810650