Malicious PDF — malware analysis report

Static analysis result for SHA-256 8146b419232f7be4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 05:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2ed4f50f836a193da2674124db764de5 SHA-1: 1790063d8b74d9c0650837585c7693abc391f2d0 SHA-256: 8146b419232f7be4a0d9ec7a0335e194119bd7899f29e35a26db9e591df2f83e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to disposable domains, suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=pokemon+mystery+dungeon+darkness PDF link annotation
    • http://parkety-patemal.sk/files/file/wopujijugivofutuv.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/vuzabene.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370823754aa---xewokivojoguxomekugalaxa.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/wufevozumewizoxukide.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/42077741506.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/63535523520.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/46637150824.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/22223525668.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/fomagukuropaxogebap.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/56168315753.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fesusotezutoxuzi.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/gogeruguji.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tevopunepisaf.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/77460145431.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/65584746900.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/zuzagegapoxuzapupijowe.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/71310596625.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/zusazobugekavej.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/kuvixupudulenese.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/251d56c69d1116eaccd5051bc4d83abb/remapoxupifuwo.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wavusituvojodevuxaduvizoz.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/93879685005.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/purawalusiwom.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/36657859447.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/pamabimodesarojaruruvidol.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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 19416 bytes
SHA-256: 616f160764a1668ac206d3d5af00a3040b1e6285b115a69e3885f37728e15e1d
font_02_sfnt_off0001223a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223A 10760 bytes
SHA-256: 97c0bb5e17cbdf3614457e4ec2f5b61e4f26a3ff18365d5c63e5d7eedd8f1b04

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