Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a87da2e8d58e66…

MALICIOUS

PDF

87.3 KB Created: 2021-09-17 03:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a80ecc119ae80feca783e2d5a47fe2ee SHA-1: aa2eb23bffa3057a15fa82230b75ebb1edeb6ab1 SHA-256: a9a87da2e8d58e664a0dea3bada7990c5d2212e520094258d803016c1498481c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious websites. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://mg001.cn/upload_fck/file/2021-9-1/20210901232954362929.pdf In PDF document text
    • https://profesa.net/userFilesfile/21036425548.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mibodutapopobaxerenid.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/72406465597.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wijurafufizogetinoxezonim.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/dodivukavodimodi.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/11/diven.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/rizofoxewotelikepikorut.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fujorijinixuk.pdfIn PDF document text
    • https://citytrafik.nu/images/file/73439205888.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54830297138.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdd0481485---61436084958.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/gixavomunop.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091014044432.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nmhkmbu7u1457t18joatksg3cc/66712397996.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/punadexapinodozanafaj.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/99365462575.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/verupukikivo.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/sidelemafafoladofevuza.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/33197588050.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/gamololutopipaseka.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bepegu.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/92921631084.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/telawixazunafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quickpic+wifi+transferPDF 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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 10644 bytes
SHA-256: b541c7ddfd8d73b2e6bfab4599eee0f48396db890c53ec56ff9035a3d727051e
font_02_sfnt_off0001143e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 22320 bytes
SHA-256: 10daeef31c81827bff93152235da15068a3ee6d4765812953be25f74bceb240b

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