Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aefff7d76f68ff…

MALICIOUS

PDF

84.7 KB Created: 2021-03-17 09:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2436a85fbfb4bc94d027301b6ed41120 SHA-1: a617e26acba22ebf7ab57a6790bc4ce55592e2e3 SHA-256: c7aefff7d76f68ff749d8fc96a5acf2a1678131db2c96c5ffc2be0a22300c8d8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, 'https://dafemum.ru/award?keyword=bteb+admission+circular+2020+pdf', is the primary indicator of malicious intent, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself is deemed malicious.

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://dafemum.ru/award?keyword=bteb+admission+circular+2020+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_600f9e1661370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60499f6998848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_600922ba7e840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fe15e8879435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fd7d176634a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_601548fe80690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_604dedd8d464e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5fe1ee25ae94a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0629f7-fbe6-433f-930c-79d5e3710ead/97340874400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828cde37-93f0-4981-a736-f1dc23ffde4b/emotional_sobriety_aa_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/blanket_weed_answer_from_cloverleaf.pdfIn PDF document text
    • http://bamesidukeji.rf.gd/15983860652.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/codycross_answers_group_297_puzzle_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5bdff5-ee6b-4295-9114-79fc489c9917/71345224911.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/physical_science_if8767_answer_key_page_95.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/odia_new_movie_video_songs_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd4e615-2781-45f8-96a6-dd2b594a386d/22532934996.pdfIn PDF document text
    • http://lofupiwosilabo.epizy.com/mikobewozos.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/xavomosojefikozupak.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 5764 bytes
SHA-256: 0b3a95d9073fee1b43bf3f02a4d1cafa9c9980868aecbe85391635d199c8485b
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 7528 bytes
SHA-256: 00657c2346e7d9ad73a3f9ec9c18b0ba17365cfc4128049533cf0c84cfd750ff
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10764 bytes
SHA-256: dee455990ce238bf8516a9eba498c0a803801db514ac651dab9fdc203b4fd3ec

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