Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89fb812d04ca721…

MALICIOUS

PDF

74.1 KB Created: 2021-10-07 22:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f4dd16d8dd8019b4ba51df2f6d9eecc4 SHA-1: 51b2bc1a4d32ddef54f7d4f778ffcbc751ba8bda SHA-256: b89fb812d04ca7219730f6da8615c29b0684278ad7e52285d472b44e9f3d4156
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://wastran.ru/uplcv?utm_term=hey+diddle+diddle+the+mean+is+the+middle PDF link annotation
    • https://agrimal.pl/userfiles/file/16458489214.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/41795142154.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/fijir.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/jebineludifobovapuvafav.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/gadenesuba.pdfIn PDF document text
    • http://gibisch.biz/files/files/turesuguwugaxudew.pdfIn PDF document text
    • https://semut73.com/contents/files/bomawu.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/widizamapuwesuxiwunew.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/75346976457.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/sexeturubetufiwexagun.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/13258475961.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210914_A73B6E41354A659B.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd7iueo22vk6365q09hclngl1u/59196216171.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/24179843366.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/84660508321.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/18509438722.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/47726069181.pdfIn PDF document text
    • http://apcmagon.com/userfiles/jaridixapelomijetikojuf.pdfIn PDF document text
    • http://fitviewer.info/files/file/57108725669.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210913220823.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/71919556577.pdfIn PDF document text
    • http://lex.tj/img/file/41140458955.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/wogoxogidasurokiro.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_off0000bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 17944 bytes
SHA-256: fdb341c50559160bdfaf5167aa59021828e6d80a6112077c4039929816a314eb
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10400 bytes
SHA-256: b8b753746d2828c400e0ed26c0b7c7e953ac2f02f300c131f1f4c0b9122b1c89

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