Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6d25dd50e0c2d5…

MALICIOUS

PDF

69.6 KB Created: 2021-09-15 15:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66d67830d724244e15e498060ffc0069 SHA-1: afda7a7c2c2fa16817cf243393f3d16c5be4190c SHA-256: ab6d25dd50e0c2d5096a842363a7f5b3fa99448f4db3e0712880ca780885993b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains. The PDF structure and the presence of JavaScript suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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 http://hzkontejnery.cz/ckfinder/userfiles/files/26609027781.pdf In PDF document text
    • http://master-br.ru/img/file/lemabamegejobomijobaxugex.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/rusobixusidalonufo.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/togimumajisudofofeg.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jamezawuzoxusedabodokeg.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/xubodoko.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/zesojipede.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/selugedisozesetulogowed.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/5219308422.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zonisolutegan.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/6937199530.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140764401b15---sekafejamowaf.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/bivibozojodumuviser.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/xodakenuxawa.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gupawivi.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65373629391.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/44725796068.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902164652.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/07o47k9l2pbvilm9ji3em388pq/mijekibojav.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/vovibi.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/9994632976.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/valimedivir.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kuwim.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokovedi.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/jirilexupak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+rss+feed+in+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_off0000b1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E1 15580 bytes
SHA-256: e8861d923ab8e95560abd35f63531c62a775211181808e8e5f11ef0854071cb3
font_01_sfnt_off0000d947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD947 10400 bytes
SHA-256: 5f01e2234d9096f7d96f8418081790f03405d61efc0501abea8f32b9ce63e85b
font_02_sfnt_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1