Malicious PDF — malware analysis report

Static analysis result for SHA-256 177f2b7d99724253…

MALICIOUS

PDF

67.8 KB Created: 2021-09-09 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84df48b803480fa5d82a55ebc49a7d9c SHA-1: edc9b2650bab9316c49c47924a1e54990cac1f52 SHA-256: 177f2b7d99724253f3d194d94c1ddf23f5cc6f6cfd8bbff706477503b47675a5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as a malicious phishing document by ClamAV and an ML classifier. It employs an image-only lure, typical of phishing attacks, where a screenshot is presented to trick users into interacting with a malicious link. The document contains numerous external URIs, suggesting it functions as a link farm or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • 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 67 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.
  • 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://viettincapital.vn/upload/files/fukipikeno.pdf In PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/neritovukotawefipuroja.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/kirokugaweg.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/fulovadilov.pdfIn PDF document text
    • http://salespate.com/userfiles/file/73266895207.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/42910387295.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d967664c998844c63e041b98e879042b/16305580331.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902084557_n1usw3.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/mazemawelibafuwota.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kojikuwelopoxamom.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/93536c71adf543baa9b71a837091d598/vaveluraxube.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/17183791198.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/wuxobasaw.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/75775241342.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/50200386361.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/nowosaf.pdfIn PDF document text
    • https://kiptep.ru/file/22760339443.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/noguturezezadoj.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/92714557825.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jokedilogavefifajipi.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/19713780274.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/falew.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/79288465345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+gta+5+for+android+70mbPDF 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_off0000adfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 14060 bytes
SHA-256: f92b5448777a7309f68463e71a7e78bbc2d4d6f17d853b1015cf1f49508b634c
font_02_sfnt_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 10928 bytes
SHA-256: 67b6ab75830ddf427589cc10641ef018135227a006e6fc89fb82c3605e790827

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