Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83fc46297bc641f…

MALICIOUS

PDF

74.6 KB Created: 2021-05-11 08:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b194a538a49d22164786d52f973612 SHA-1: d496f4a9ccbf6b45f21ecf19f1e967b1ca42a77d SHA-256: d83fc46297bc641f45d793546a4cc23520ee50ae3240016d2adaa86a0b0b07d1
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 of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=replacement+blades+for+norelco+5000+series
    • http://suzaxikuzexaw.66ghz.com/47804401736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_5045fea22d4b4dfea5ef3cf7650a868a.pdf?index=true
    • http://fefiraxubuviwep.epizy.com/arlington_heights_park_district_summer_program_guide.pdf
    • http://wokobunowome.epizy.com/92743219342.pdf
    • https://s3.amazonaws.com/ninasivol/vaxanozujomukoga.pdf
    • https://s3.amazonaws.com/gogunabones/86781545992.pdf
    • https://s3.amazonaws.com/zubata/10216961166.pdf
    • http://niserikotul.rf.gd/1477628550.pdf
    • https://s3.amazonaws.com/ximupuv/2174587454.pdf
    • http://nabukewegurizev.rf.gd/lunetozetero.pdf
    • http://zivusiden.rf.gd/yoga_poses_for_beginners.pdf
    • https://s3.amazonaws.com/ganubatebedoxez/devinejoza.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_bb8b1f54bdc94f6e87093848658b147c.pdf?index=true
    • https://3c59ccad-08dd-474b-8af0-a42d91f20399.filesusr.com/ugd/489ff0_9530456060934ae78ee81d2a4e186033.pdf?index=true
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_57f3aee03005481bacb259b7640330be.pdf?index=true
    • https://s3.amazonaws.com/wonumafubij/zetesoropujavo.pdf
    • https://s3.amazonaws.com/tuxenipup/what_does_cronbach_alpha_mean.pdf
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_07d1254d1cb14ab286aa40df7fc5d822.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_9a618fa4d0f94675a037792a41803afb.pdf?index=true
    • https://198ac300-f2de-41a8-aaa9-2df0d2bfefbb.filesusr.com/ugd/232b71_7e8817a8bc4243179d914f20bed9ceba.pdf?index=true
    • http://wosolebaxuwutux.rf.gd/fiction_story_elements_worksheet.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_86edc83332dd460da2f63c4beab91f1e.pdf?index=true
    • https://s3.amazonaws.com/lixasifasi/xizumum.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_off0000d7a3.bin
3205e2260f3ed74533b84ddae14470ebe121eb21ce0b59e56a500bd87da1459a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 5504 bytes
font_01_sfnt_off0000ea3c.bin
fc5a988c1a2edbcdeddf6465a1cd86f845b0376a3c807cb25ebf8434a3adc962		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10804 bytes
font_02_sfnt_off00010ef0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 4324 bytes

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