Malicious PDF — malware analysis report

Static analysis result for SHA-256 dda5e2245b9a63d0…

MALICIOUS

PDF

81.4 KB Created: 2021-03-23 12:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b320a99a25ba713d55d1b398b8b4394a SHA-1: f0b4fc0a051ff123983d69d252a8002ce00268aa SHA-256: dda5e2245b9a63d0da6fb3984fe4738649b7b9edde9f2c711831f79874633b79
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=what+colors+do+mini+dachshunds+come+in
    • http://ogranifruit.space/desijapejizafujumawutz4e35.pdf
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/puguloterina-wesupe.pdf
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/zamumoreruwitakowaxe.pdf
    • http://tramlaweq.online/174794448934bma1.pdf
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/3757896.pdf
    • http://ecosbor.net/nebivukukitessv6f.pdf
    • http://instgrmmverifiedbadge.com/64644523916bx36u.pdf
    • http://shortsomfj.space/how_to_use_a_brinkmann_smoke_n_grillfc9j7.pdf
    • http://pressit.space/les_miserables_2019_movievv8ta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_46e1c2893b6148cf9e2500b4343a6b31.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/zuzokivam.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/susezamalikefen.pdf
    • https://uploads.strikinglycdn.com/files/1f653692-604f-47c0-a268-8ea9b16ecafd/gameboy_sp_ags_101_vs_001.pdf
    • https://uploads.strikinglycdn.com/files/d8d44b0d-59ad-4812-afb5-d67e637a8e55/how_to_connect_singing_machine_to_youtube.pdf
    • https://s3.amazonaws.com/vonutavekip/zewotabobonitukizesagobat.pdf
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_c28804445faf4ba49c26313da4239efa.pdf?index=true
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_7be668199e814211b6389a52b18aaa0f.pdf?index=true
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_4b9f5434c4ea4ff3b7cce24f1f4c434d.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_d4a67eac52ce4511a37a4941255bdf92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ccafc7b0-e01f-49f8-a8c6-f2b3db542e96/isaiah_53_5_explained.pdf
    • https://s3.amazonaws.com/wovedukevikov/wufemux.pdf
    • https://uploads.strikinglycdn.com/files/57f947e5-0092-4f1f-8997-2c285a70be9e/what_does_the_term_legal_standing_mean.pdf
    • https://uploads.strikinglycdn.com/files/6c6635c5-9ad2-4703-8aa2-00d99517436e/93287648310.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_off0000f3f5.bin
20ad7ed34926a19610bf6fdb4af444531eab4a2fa108b515de06162411f0c873		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 5072 bytes
font_01_sfnt_off0001050e.bin
da59fcb6738011cd59a6a2641a4bc32eec8d7dad584f9de410e4bcbdabbc98c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10688 bytes
font_02_sfnt_off0001299f.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 4324 bytes

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