Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c39aa9120893539…

MALICIOUS

PDF

77.7 KB Created: 2021-03-12 03:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 50a3d32ad326737ef3ccf362cd810e08 SHA-1: 0a342a509b8ccf6028285ab155695cdd5823351c SHA-256: 7c39aa9120893539161e3d29fc041a4765ff1f7fc23d76b1bb0584e2c461d476
222 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, many of which are likely part of an SEO link farm to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the overall structure suggest an attempt to redirect users to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=anatomy+for+sculptors+pdf+google+drive In PDF document text
    • http://xagelofitu.22web.org/54942113659.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/tapelu/82006862967.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0270c8ea-9be4-41fb-bb42-9f89c6d4fb8d/xolela.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/science_teacher_guide_grade_8.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_4e9163fefba24aa2b72a6712771c91dc.pdf?index=trueIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_0726d90b66ea4590beed2e828d5d32a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad671d2d-9201-4999-b3ed-74e314c4b7a3/deviwejejixatekaro.pdfIn PDF document text
    • http://tidinofo.epizy.com/54753575275.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/terikizim.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/totek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c4114f-e2c2-4c6f-ae21-eef005325dc2/rasurufulageladojitobaxev.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_a1a1bf6e19a140e9a12bfc8a396db6e1.pdf?index=trueIn PDF document text
    • http://manuwebibu.rf.gd/project_scope_management_example.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/best_autocad_viewer_for_mac.pdfIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_e20527bc997f4ae0875b358234e9e2e1.pdf?index=trueIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_3831bdbf436e4865a549988ae7f59eb0.pdf?index=trueIn PDF document text
    • http://vibakiwijikilok.rf.gd/jurassic_park_theme_piano_sheet_music.pdfIn PDF document text
    • http://gipipirerogarul.rf.gd/zetime.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/o_butterfly_tamil_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30bd486f-667a-4844-a0e5-da69339ae2ec/jurowarakiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69fe9b39-581a-4695-8ae7-54183ca81f5b/taco_bell_soft_taco_no_cheese_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/jesus_the_great_healer_bible_verse.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_b697eab7dbdc4503a0f54f8bd36ce2a0.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_cdb40fd09dd04e56b7d55d1540ab97e5.pdf?index=trueIn 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_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 5628 bytes
SHA-256: 709652792cf2ed7771171854034e679b7d33192a8ff8f57b85f311fa3fc6fc85
font_01_sfnt_off000106a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A6 10096 bytes
SHA-256: 974783e2a1f26a17b2f5a3bb202efbcf6903299f0e6a31381d17769675df9e6c

Open this report in the interactive analyzer, or submit your own file for analysis.