Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056c5d506f72ec3…

MALICIOUS

PDF

87.5 KB Created: 2021-02-11 02:28:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6bf7ada2fac508368f4e05c9884e1af0 SHA-1: afd0027d1d230d3842c9a26e85ecfe19d32969e4 SHA-256: a056c5d506f72ec3141617bd3950aded6a72bfea1e89a9fcc8563bd0866bfddd
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=showbox+download+apk+latest+version'. Additionally, a machine learning classifier strongly flagged the PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of a visual download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/123?utm_term=showbox+download+apk+latest+version In PDF document text
    • http://babubusawase.22web.org/pededizaladedoxixijebelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fe271bdc0d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_6006e15315b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_60113598c2507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_5fe95420cf5e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lavebaku.rf.gd/vurajexasezevaguv.pdfIn PDF document text
    • http://bukulifuxevet.rf.gd/kepufet.pdfIn PDF document text
    • http://bomigezi.epizy.com/tamesitununamibilas.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/54444560269.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/bachna_ae_haseeno_song_raagsong.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/surf_report_biarritz_plage_des_basques.pdfIn PDF document text
    • http://veduredetud.epizy.com/atmega32a_datasheet.pdfIn PDF document text
    • http://gurebuvijo.epizy.com/7869989322.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/jipuridef.pdfIn PDF document text
    • http://mamesejo.epizy.com/86669518311.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/lizaloso.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/14355660204.pdfIn PDF document text
    • http://birotizedu.epizy.com/charades_app_apk_premium.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 5364 bytes
SHA-256: a023598e4380d90f341f8caa287e9e140d96adcb31ffa0451ff7e4ed9f80d2b9
font_01_sfnt_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 11028 bytes
SHA-256: 32143f08cc740751c0344e63ec30ecff661a0fa4862052178445562f5051a990
font_02_sfnt_off000140d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176