Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a61d185915323c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 10:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8d488d001ea6ec01b5384616fe452327 SHA-1: bb75e201cab760c7efbc992eb3d9f952246cd75c SHA-256: b0a61d185915323c4ee9e9ff6b5952d237337f8ff4a6948fa4c8b9f06ea1ea77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-based content, typical of a screenshot that hides a clickable link. The document body is heavily obfuscated, but the presence of JavaScript and numerous external URIs, including one hosted on a disposable domain, strongly suggests malicious intent. The ClamAV detection and ML classifier further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobit.pdf In PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/62676671015.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/kapizipotakogomepatomel.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/44505603904.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/kafik.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mapejusig.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/6018437081.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/muzewane.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/xiniweg.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/jorarirava.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/24882069210.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/33298022376.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/37834807431.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431035961c4---voxirunodewupovapizetisoj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/32314182019.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1632724438.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zutenisumemosevo.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/67454645799.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49514368432.pdfIn PDF document text
    • http://horvathortho.hu/tmp/99855716632.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/36933511911.pdfIn PDF document text
    • http://nanopena.cz/upload/file/14902301787.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86221429249.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xonis.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/kilojaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=birthday+wishes+to+son+in+law+imagesPDF 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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E9 10948 bytes
SHA-256: 5a32322922b39146082ce218aadd3fff772c97640cb2e99747fe120fdd8bbe8b
font_02_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 14068 bytes
SHA-256: 27207b350dd2158352e22e02b35b6c29fa000b88b4cf2efce595103b8b0709ef