Malicious PDF — malware analysis report

Static analysis result for SHA-256 47b7d5fe01f10267…

MALICIOUS

PDF

72.4 KB Created: 2021-03-29 21:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78a766d794181d941c365582da37a38f SHA-1: a37c769ebf1d1b7a63665d906bfcd712673eac2c SHA-256: 47b7d5fe01f10267abd40686411e444d518dd617eb50bdf036b00beedbc456e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/aws?utm_term=magic+mouse+2
    • http://tadidavazutopa.sportsontheweb.net/best_homemade_diet_for_dogs_with_ibd.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_603f99bd59fd4.pdf
    • http://bagidopivulo.mywebcommunity.org/31913909504.pdf
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/daa14a3e3ffd.pdf
    • https://tufutimijota.weebly.com/uploads/1/3/4/3/134350929/4884893.pdf
    • http://nenonazuf.scienceontheweb.net/telugu_antakshari_songs_list.pdf
    • http://nefupanono.mygamesonline.org/dnya_haritas_hd.pdf
    • https://static.s123-cdn-static.com/uploads/4376358/normal_5fcb25d173d10.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/9357654442.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zusevamasor/brother_printer_hl-2140_user_guide.pdf
    • https://s3.amazonaws.com/xoxaneral/47238803425.pdf
    • https://s3.amazonaws.com/gasodamuza/doninn_audio_editor_full_apk.pdf
    • https://s3.amazonaws.com/pasawe/60404219325.pdf
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_7a78c354814f4da894ebe7f6047751d5.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_a850074fda6a4726a54bc41fbb2d8254.pdf?index=true
    • https://206c1dc7-391c-4b20-ac64-b63c97020fd4.filesusr.com/ugd/87773f_81ea352146fa433eae0817e74f439d2c.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_fd3d1d1cb4f3482ca36f3d447b372da6.pdf?index=true
    • https://s3.amazonaws.com/setikizo/xujoridowojonodubagoxa.pdf
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_f69529c2641f4c199b927b036f9540fe.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_898287757b664a0abd533867d6353945.pdf?index=true
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_869c49006ee3441ab8b40e195396a65c.pdf?index=true
    • 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_off0000da46.bin
dcad5647014a7541570da49d54fcfc0a88bfeaf8f57554ac5358900a4bb07e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 5128 bytes
font_01_sfnt_off0000ebbd.bin
12dab318599cc830e121afc510e94bfcdce412774cad6b50688cd93337f93a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 12084 bytes

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