Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a90747a36750829…

MALICIOUS

PDF

80.5 KB Created: 2021-04-01 20:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7262c540baf62d8f495ca53112682089 SHA-1: 266ef457532c2ccc9bc5a0efcf0e00c12054d9e2 SHA-256: 4a90747a3675082934da399c1153af087cb0b09e6bd3610b35186d31091aa777
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 point to unknown or potentially malicious domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan threat. The presence of embedded URLs and the PDF structure suggest an attempt to direct users to malicious content hosted externally.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://golowaki.ru/strik?utm_term=ultimate+spider+man+game+play+free+online PDF link annotation
    • http://kieverts.xyz/wonoroxosukanapesebur9e7x2.pdfIn PDF document text
    • http://cashthe.ru/zokonabotpmkv.pdfIn PDF document text
    • http://bandalet.club/60149652936ox6f5.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/binozu.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/rimavirupuru.pdfIn PDF document text
    • http://drnextact.xyz/23736563188rsbsj.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/91469966428.pdfIn PDF document text
    • http://nakanilo.club/aldous_huxley_un_mundo_felizrd1ig.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/precalculus_with_limits_larson_hostetler.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://natizuf.onlinewebshop.net/mathematical_logic_ebbinghaus.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_4f14c90a65ad473ebe7e184f99d68ce6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/86103742673.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/exception_in_c.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_92332d9212d44fd781bc357972aae804.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/sunozasikurikuvivudopa.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_d4cea0b0a15342c49b2cbfee2ffa62e4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/40532914438.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/cam_camera_apk.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_e93096e594044d6083749f8a2fd95185.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 5244 bytes
SHA-256: 3d189fa271b2c38e46783cac57ee5236797c4d75fe43513388a7d08dfd815b47
font_01_sfnt_off000100aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 11164 bytes
SHA-256: badf2fc854b0402c5dadc398120352ea6069232815f234b63bb747f9b74208de
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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