Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e1d7ed9d567846…

MALICIOUS

PDF

70.7 KB Created: 2021-05-19 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f451e7f02511b5caabd0a9537030a93c SHA-1: 2e88b5d9d876238a4ebf88cbffea5817c0602792 SHA-256: 11e1d7ed9d5678464a59561cb8a53ac8b9252249c9b98b8928b5b9e58dda02f1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated content, which is characteristic of SEO link farm abuse for traffic redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the primary URL. No scripts were extracted, but the PDF structure and embedded links suggest a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=pharmaceutical+dissolution+testing+pdf
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/8c472b5f.pdf
    • https://vumukawa.weebly.com/uploads/1/3/4/6/134662430/186d8e628905.pdf
    • https://static.s123-cdn-static.com/uploads/4418587/normal_600003bb98e86.pdf
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/regokasuw_zuviwox_linasezit.pdf
    • https://cdn-cms.f-static.net/uploads/4426957/normal_600fa27556496.pdf
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ff03650eb6ff.pdf
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/7951882.pdf
    • https://fokakumunimu.weebly.com/uploads/1/3/4/2/134266115/xusefepebuza_tunag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/821cdbba-bef2-4876-b3b9-dc0744a6035f/49689060960.pdf
    • https://uploads.strikinglycdn.com/files/35531a9e-2cce-40c4-96c7-306f2c66930e/32164366608.pdf
    • https://uploads.strikinglycdn.com/files/e6117c4b-220e-4618-8049-3c6e0db389a8/40974143477.pdf
    • https://uploads.strikinglycdn.com/files/54b4f889-52fb-4417-935a-a200820a2acf/lg_wireless_earbuds_with_microphone_for_iphone.pdf
    • https://uploads.strikinglycdn.com/files/c0cf25bc-4f3c-4465-b577-f41af209b068/pexapopowesuwovatodo.pdf
    • https://uploads.strikinglycdn.com/files/bd182a17-64e6-4afc-b85d-19e3a5bfb788/how_to_prepare_a_interview_presentation.pdf
    • https://uploads.strikinglycdn.com/files/4b8ebfcb-c17f-4d76-939f-f482c6c6d975/ninja_blender_replacement_parts_ebay.pdf
    • https://uploads.strikinglycdn.com/files/178d2238-d052-4211-88c8-459cf17d9a63/pexigagefodeze.pdf
    • https://uploads.strikinglycdn.com/files/05c68b34-fabe-4feb-8214-dfc66293d06b/tattoo_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/1662a5a1-68fc-4aa7-8ff5-2eccf704d149/75122401596.pdf
    • https://uploads.strikinglycdn.com/files/8f94af00-3afb-4542-a227-3dd796d7d34f/how_to_get_sponsors_on_tiktok.pdf
    • https://uploads.strikinglycdn.com/files/135dbfd1-c1f3-40be-b33a-bbd5f550f1d2/annabel_lee_tavern_reservations.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d9.bin
0f13fd3cc7f535f1704c9559207cf19567f7905b14ee015be900e3ab93d1be88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D9 5568 bytes
font_01_sfnt_off0000ea9f.bin
388d22e4e20d2bb2aec1042834e54c2d6c13a2be6cbefd983a2547ce55d12fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 10280 bytes

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