Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba42c544dd74d785…

MALICIOUS

PDF

82.3 KB Created: 2021-04-17 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4dd569b625c3b36abc35c28fa9809e0e SHA-1: d042cc347e9c796e7d4dbf7d995d1b6e286ed5be SHA-256: ba42c544dd74d785a897c257c4df9ff2c4f5efb595f461febb5a08ac92224363
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 ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to search terms that could be used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=itunes+hip+hop+charts+rich+brian PDF link annotation
    • http://bamebefexa.22web.org/tetexeroremifetevura.pdfIn PDF document text
    • http://airbin.top/call_of_duty_ps4_vs_ps58ytxc.pdfIn PDF document text
    • http://profer-opt.ru/bts_albums_freeenufq.pdfIn PDF document text
    • http://ejqy.com/nurafiwub5a7k.pdfIn PDF document text
    • http://solent.bar/xawujupudupitopeyhnwz.pdfIn PDF document text
    • http://goodnaturak.space/big_data_book_free_downloadpnoal.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
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_796384271d264a0abd3cf08454f459e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolawatin/19268803027.pdfIn PDF document text
    • http://volisaberok.rf.gd/6938118539.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_3b9870980f01421395d1b67cd4c61675.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/plan_de_negocio_crianza_de_cuyes_peru.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/90753463347.pdfIn PDF document text
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_76b82052a5b445a2a1e9ecc08606e44f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/253b207e-02de-477f-ae45-0240f54568f9/fatigue_icd_9.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/zetexufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfab534-8da3-4149-95e7-92c026e35ce2/how_to_reset_logitech_harmony_650.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/lifestyle_of_a_peasant_in_the_middle_ages.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/john_deere_mowers_prices_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c34930-6b9f-4e32-9405-782e07d50c75/how_do_i_reset_my_lexmark_printer_password.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/ms_word_business_report_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/rixan.pdfIn 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_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 4948 bytes
SHA-256: 3f87550dbcfa58044d8bbb932a58567865c9b23aa587689fde097486aa2d2bc2
font_01_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 11132 bytes
SHA-256: 477b06bf9de2b21137141722b5717e02134cd0585a1addb8cde760d3bacf70ef
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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