Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb63531f1a2ff6d…

MALICIOUS

PDF

75.2 KB Created: 2020-12-29 22:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9456354274c172e55f4b25330939ed13 SHA-1: 7d510029de74026d6eddf80c9ed0bd3acd5e0f71 SHA-256: 8cb63531f1a2ff6d190d4b7baf970ec976faebffb6a554b988b1f6769d25719e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure point towards an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafftec.ru/strik?utm_term=history+of+christmas+carols+pdf PDF link annotation
    • https://cdn.sqhk.co/libarazituw/icgjiaw/pixel_3a_xl_force_restart.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/Sltjgig/jizenirexulidatuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pisupuwov/jdq1NNQ/78539739533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fba47ab94982.pdfIn PDF document text
    • https://cdn.sqhk.co/palazawu/jiWH2hj/tisovuxujikamidewawit.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/hhij4VN/good_2_player_games_ipad_free.pdfIn PDF document text
    • https://tugagifozige.weebly.com/uploads/1/3/4/2/134265986/demetuze.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/pobuxojug-kuzadoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5fdbb3f32d1ca.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/rifhbxf/4737604409.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/grig4Ei/video_player_download_for_laptop_windows_8.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/gogonof/mugemosiwux.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/deep_dive_into_android_ipc_binder_framework.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f4f4f9-c37d-4e0f-9251-8bb5db7b1a7e/zigexezodaposuzenik.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/taylormade_burner_09_driver_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/42890066976.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 5456 bytes
SHA-256: 7e9ebe9a59ab5bf9035cf769fcf2f5b5dcbc00996b50dd920703dcf19058dbe7
font_01_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 10548 bytes
SHA-256: c389748c4795f1ff0240242f5de28a82cfaf55977aa333381e0387641b6fc69d

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