Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc799faaf2de08b…

MALICIOUS

PDF

124.7 KB Created: 2021-02-13 20:20:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a55feab81176a3a6869b568621c8c45c SHA-1: 4c9526288365a82445ae3614c75166a50dcb096f SHA-256: fdc799faaf2de08b8814bcb2bc18c36d930468cafa01674887331e693a7328ed
154 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/wb?keyword=types%20of%20reinforcements%20in%20composite%20materials%20pdf'. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The ML classifier output of 0.9998 further supports its malicious nature. The embedded URLs suggest a phishing attempt, likely to steal credentials or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=types%20of%20reinforcements%20in%20composite%20materials%20pdf In PDF document text
    • http://teren.fun/counselor_education_and_supervision_author_guidelinessaxei.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_600dcf7f1ac4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401973/normal_5ff898c71eeb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_601ab78d346da.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/dexodekelaseki/58329714692.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/mufufoga.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/anaconda_film_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/champcash_pro_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/blind_date_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/fabobefexoziwojima.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/bigg_boss_telugu_promo_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/69563793754.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/gurabi.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
    • 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_off00018e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E15 5352 bytes
SHA-256: 9ed313a0068fdf34fb103c1b2766f95b5f42df135e9a53336c92d4443d3d8df5
font_01_sfnt_off0001a038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A038 14144 bytes
SHA-256: 679ed6a6dadd8f1ceb58464053b2a6a07f27d10b1f4e39655cfd273337956fd2
font_02_sfnt_off0001cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFD7 16200 bytes
SHA-256: 3867278592a2b4afbd44f6ca9517b7cc8ef861e24087d1784f66d23a4462128c

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