Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af6aa8b3811aca2…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 04:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2ff99d93c77ea1838f5a8a99e8a0bb3e SHA-1: 08eae666b06b05df8d82cbef1458629492e6732f SHA-256: 1af6aa8b3811aca24de0534fcac4028752d9e6e5580f322e52d1831bff16c469
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=my+keurig+2.0+does+not+have+a+water+filter PDF link annotation
    • https://cdn.sqhk.co/ruzaxube/9nCWidj/shark_wallpaper_for_phone.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/63284623600.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovusig/hThe2Q1/zedge_app_download_for_android.pdfIn PDF document text
    • https://fumimukewagur.weebly.com/uploads/1/3/5/3/135321221/fejiradar.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/little_fires_everywhere_season_1_episode_4_recap.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/vukelefegitej-zesavinazejitow-wareba.pdfIn PDF document text
    • https://fogasofimoxor.weebly.com/uploads/1/3/1/0/131071298/sizozupol.pdfIn PDF document text
    • http://ganexofom.iblogger.org/figelifoxenatadowevireko.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/hWFXjbZ/watch_netflix_with_friends_chrome_extension.pdfIn PDF document text
    • http://ruperamumafuvaz.22web.org/another_word_for_detailed_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosatetirudipu.epizy.com/jenikubukeripe.pdfIn PDF document text
    • http://tumuxisirawev.rf.gd/55451880146.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/statistics_in_psychology_course_online.pdfIn PDF document text
    • http://mijekobafenado.rf.gd/gubida.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/92969913084.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 5796 bytes
SHA-256: e88a9c70d5602faf87bcece20fee4dd133609acfe891b76e31e097494f08071c
font_01_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10640 bytes
SHA-256: 149a681d8ab3a9aab890b9ac6d8798a70f6b6b15e538de9a39eb7b897ac45a83

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