Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fb926ec8bd1c19…

MALICIOUS

PDF

92.2 KB Created: 2021-02-18 11:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4dc00dfe8c40d9920e5813c2db0a5bf1 SHA-1: 27ee2e1d331e33b07e8821ab3a518ac87b9649eb SHA-256: 28fb926ec8bd1c1907e57a795610a58d76ba433480f97c4e26ef9ba6e815af4a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/strik?utm_term=pak+study+mcqs+10th+class+in+urdu'. This indicates the document is designed to lure users to a potentially malicious website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of PDF redirection often involves embedded JavaScript to trigger the exploit and subsequent download.

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/strik?utm_term=pak+study+mcqs+10th+class+in+urdu In PDF document text
    • http://meinekarten.best/sentence_fragments_exercise_1_answers112w9.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/bhfgcje/vafigudusawudejizunedi.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/Jia9iaD/buy_police_scanner_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/jjmlUGr/82239953185.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/1jaaKJR/rainbow_ice_cream_sandwich_maker_ice_cream_shoppe.pdfIn PDF document text
    • http://nuverlites.online/rugijejoloxulureni6mqc1.pdfIn PDF document text
    • http://2022god.com/hp_2620_printer_price_in_qatarsk7y5.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/laradusa/vefazirosizalenipi.pdfIn PDF document text
    • http://warunegiluj.rf.gd/paperman_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/remefesukip.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/zarumalupumemiwupewag.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/wevujawavisozevinujazafa.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/eviriyle_ren_zer_kiraz_indir.pdfIn PDF document text
    • http://dalumawinalejat.epizy.com/meroxugavalosutuzi.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000143c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x143C6 19608 bytes
SHA-256: 1e501f0db775f8cbf5444049aaa4afc7ab108b1f98ed7ead2ffe19a8751486d5
font_00_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 5664 bytes
SHA-256: 5b95e3d070398cae6ca13f544ee585aef7f3fd978e7807c7730691ba31bdffe9
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 14240 bytes
SHA-256: a9dbd0b817dec09a0ecc3be798eaf749ee8f65af657868129956a1ce97b8a437

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