Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e2f18fc3bb9f94…

MALICIOUS

PDF

74.3 KB Created: 2021-03-21 10:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 35cc6300879d609cdf60fb99047c3dda SHA-1: 73773da3b38639168ab357e4277a96f7355faf77 SHA-256: 49e2f18fc3bb9f940e000ba1438c7d38a4bbb5ed87255a64d2111bbe254990ab
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=what+do+good+teachers+do+differently In PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/wajed.pdfIn PDF document text
    • https://fegejakir.weebly.com/uploads/1/3/5/2/135299458/baxuxiteraxaditazizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476782/normal_6029d7fed4e52.pdfIn PDF document text
    • https://gokipojunarofaj.weebly.com/uploads/1/3/4/6/134635425/8057856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fc74787bb6e2.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/diravaliw.pdfIn PDF document text
    • http://idealica-it.website/expanded_form_worksheets_for_1st_grade25ijc.pdfIn PDF document text
    • https://jewojumafolu.weebly.com/uploads/1/3/4/6/134651010/gokekag-wanedolugowe-lizusasana.pdfIn PDF document text
    • http://lumacy.site/aha_music_apk2tyhw.pdfIn PDF document text
    • http://helplnstagramoffice.com/146224350980ali4.pdfIn PDF document text
    • http://auth02mobility.com/bose_wave_radio_price_usap21bx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/chibi_papercraft_template_maker.pdfIn PDF document text
    • http://butokerisutu.epizy.com/how_to_connect_bose_remote_to_lg_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/78500435953.pdfIn PDF document text
    • http://vuzujalaj.epizy.com/97069752294.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/java_ee_8_tutorial_download.pdfIn PDF document text
    • http://bewidiri.rf.gd/apj_abdul_kalam_tamil_kavithai.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/one_minute_mysteries_book.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/difference_between_cal_king_and_king_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/asc_timetables_2019_crack_free.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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5400 bytes
SHA-256: ef3ef5576443c6b119949e146800c48c3138128a0e44e41c58e9ee2bb6b5da05
font_01_sfnt_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 10688 bytes
SHA-256: 4a71a3ca0a33ffbbd790852c573330ce8de256c7db2fbb19a2c8e446cd960b41

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