Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9771963c0f2b015…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 22:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fae9725a982124904d1822021b1f37c8 SHA-1: b7968a3f8f0e982309fdba09bdc309cb85228903 SHA-256: b9771963c0f2b0155222ac2b6f4bd87780d8facb89766dfa86a6ae37a6b48ec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, including an image-only appearance and embedded JavaScript, designed to deceive users. The presence of numerous external links, many hosted on disposable domains, suggests an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 70 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 https://laborke.ru/uplcv?utm_term=wpa+wps+tester+premium+apk+free+download PDF link annotation
    • http://drtamerturan.com/file/dupojef.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/27140861284.pdfIn PDF document text
    • http://chongros.com/userData/board/file/vizoveveroz.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210914150419_97731294.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/70117671091.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/jisused.pdfIn PDF document text
    • https://lapakunited.com/contents/files/32479661244.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/29768664486.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/42076632362.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/pejolisusabanemokovi.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/29562656998.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461f499aedc---83271679392.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/43540900206.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/97515624659.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/nevadokejagizu.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/mufaju.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/pujume.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/77338771243.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/59207463523.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pelivog.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5ec79e9f---74439868836.pdfIn PDF document text
    • https://limadelimon.com/images/file/lujoxapinoduronopurak.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/14438103489.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/burunonagidali.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/18352456511.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/52846071524.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/33168746191.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_off0000b576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB576 14420 bytes
SHA-256: 24df400a19ff56a3cd03120ba5f7846b099e496a230c9762f5c512d68a68916b
font_01_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 10928 bytes
SHA-256: 157ba6e5d43ee7d02477ef585ae799f3586e9bb8fe1db69e25a7c2a56f086f63

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