Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc64fd07a2c08e6b…

MALICIOUS

PDF

76.0 KB Created: 2020-11-23 06:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a488f75819a3427085b6c74772078cb2 SHA-1: 5d367169cc716635310eb732d8f9c491deec5ffa SHA-256: dc64fd07a2c08e6b31f6d562b9a90e6bfa9079add844324abb15c944a4fa6e3f
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the presence of numerous links and the malicious redirector suggest an attempt to drive traffic to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=republic+of+molossia+reddit
    • https://jumolemema.weebly.com/uploads/1/3/4/8/134853288/sikinur.pdf
    • https://fodorofofojep.weebly.com/uploads/1/3/4/7/134769626/lopaxe_kalutevaxunaxa.pdf
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8a0e70a0df4.pdf
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f87af607f1cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50fd8ce5-990d-4a94-ac77-52a6fea58fd1/49857057780.pdf
    • https://uploads.strikinglycdn.com/files/fd09ae9e-18ad-4708-820b-fd6035764ff1/49533007693.pdf
    • https://uploads.strikinglycdn.com/files/82525608-8866-42ea-a5d5-71c98e34f02a/hard_times_by_charles_dickens.pdf
    • https://uploads.strikinglycdn.com/files/3665724c-89df-49e9-b84e-af3cbafd4695/defotum.pdf
    • https://uploads.strikinglycdn.com/files/f04c449c-6672-46a5-bd3f-8b7f6f825252/24000404032.pdf
    • https://uploads.strikinglycdn.com/files/b485db4a-d2a2-461d-89a9-9568fe601dcf/nw-31201-7_ps4_fix_2018.pdf
    • https://uploads.strikinglycdn.com/files/03cec4ea-ff3a-4ea5-8f3c-9e9ff5fecb5a/me_myself_and_irene_download_movie.pdf
    • https://uploads.strikinglycdn.com/files/0da84e15-97e9-40dc-9859-fb5aae474be4/70491688371.pdf
    • https://s3.amazonaws.com/xufaxoferugod/26631907917.pdf
    • https://s3.amazonaws.com/vasagesorajirem/73088846164.pdf
    • https://uploads.strikinglycdn.com/files/388a692e-7530-4a0b-8ab2-4b471decefb0/long_horse_vs_siren_head.pdf
    • https://uploads.strikinglycdn.com/files/b1a63f07-72fd-4e07-820f-5e611763be1c/cartoon_network_summer_resort.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1cc.bin
85e1067d1a3d020eb1a7e7a1c505c6926f5ec6414a3e7b3bb445f931098c8d90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CC 3260 bytes
font_01_sfnt_off0000dd87.bin
bb0c1c39ac0de2ede03a52ab3f5ea137611cc9fdd357717715d23d3c001b7dc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 5448 bytes
font_02_sfnt_off0000eff4.bin
af142ad018a0e5c9edd19844758c54a34d4418f3829b1256b978551422b465e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16160 bytes

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