Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92a1013d77aa3b1…

MALICIOUS

PDF

104.2 KB Created: 2021-04-13 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a87d1e9b5828aa95e2423dbdd031b336 SHA-1: 218a8cf1e0c33987a285b55631e41390c0a7c695 SHA-256: b92a1013d77aa3b1b2743c571db67111c0451f23dc5a721f1565f5e7bb57e45c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The document contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading a secondary payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=arifureta+shokugyou+de+sekai+saikyou+light+novel+volume+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495975/normal_6010955a8a245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470679/normal_602a90d0338b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fc9158610823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fe63e45b64a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_606d17b71c230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454670/normal_5fe23a94ae59b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465543/normal_600827e9730bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459482/normal_6041f1a585f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389354/normal_606c6e76dc1f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504568/normal_6001d6a7c697b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473031/normal_6001ea7d9d68a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_6015ef233129f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_605dce0f27cf7.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
    • https://uploads.strikinglycdn.com/files/356fb5d1-a77c-4077-b854-5d87182fe060/can_you_put_a_trailer_hitch_on_a_rav4.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/31376502404.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/introduction_of_report_writing_in_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35231b6e-bd68-4fde-92e7-da1c6d7221d6/temple_of_seti_titan_quest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c2096a-327c-4562-bc53-137c2f9a65cf/82081073230.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/fosidebopadokigosidaku.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/airmen_form_2018_last_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8952c9c8-93dd-47b7-bf52-05055f8d94df/the_practice_of_statistics_in_the_life_sciences_4th_edition_chegg.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/mubaloxefa.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/sekafunogebekisuni.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/hematology_full_book.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 6372 bytes
SHA-256: 20eb2cbe9fea0ceb88fe331353531d3cd4049af188afdba6dd94ae2c11347f6b
font_01_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 5572 bytes
SHA-256: a90970c6e0c6bc11facd3e9b3cff9bbeabd0e7049dcdd354466e65815b79eff3
font_02_sfnt_off00014869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 11016 bytes
SHA-256: ea84a6019122bc9a712269839f06ad453f9262a999f01cfa1e4f7fd4abe6e010
font_03_sfnt_off00016e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E32 16316 bytes
SHA-256: e027b4e2c3c3b76bf646cc798b200c38c264dc8a69b54595510e106be86a6973
font_04_sfnt_off000183f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3