Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec53228d8c864495…

MALICIOUS

PDF

91.4 KB Created: 2021-03-04 02:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf5bf3382107b644ffbd3c256698fa07 SHA-1: 00ac18d9f08ad808ec5850364ff4feef674ab6a1 SHA-256: ec53228d8c8644952abe53e4797775b5bd7b60ace31238f5cb44fd88e8dcd4aa
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'maypoin.ru', which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious resource, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/aws?utm_term=how+to+repair+saxophone+pads PDF link annotation
    • http://re-prime.ru/what_comes_after_rapture_in_death5ar33.pdfIn PDF document text
    • https://pibefugaradaxo.weebly.com/uploads/1/3/1/3/131398186/jorikerotujakufodes.pdfIn PDF document text
    • http://ctuxuu.com/sat_word_list_1vyw6b.pdfIn PDF document text
    • http://x-bionic.shop/nasb_giant_print_reference_bible_genuine_leatherycz45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/49058636191.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/us_army_dress_uniform_guide.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/43767472722.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/batata_palha_elma_chips_informao_nutricional.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/corrective_preventive_action_log_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/request_letter_format_for_adding_authorised_signatory.pdfIn PDF document text
    • http://xulitapaxi.rf.gd/nusibulumakifut.pdfIn PDF document text
    • http://wobuwikag.epizy.com/nazotemewavebarozuzifin.pdfIn PDF document text
    • http://renawexit.epizy.com/mibasekupo.pdfIn PDF document text
    • http://ritanuwo.epizy.com/fundamental_operations_on_integers_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/ahrebates_com_rebate_form.pdfIn PDF document text
    • http://kediresij.epizy.com/nra_range_rules.pdfIn PDF document text
    • http://morisexisaxewa.epizy.com/5_choices_to_extraordinary_productivity_amazon.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B95 5136 bytes
SHA-256: c9634d1607bbe8ca6e5ebc7eb58cad3ca7ecb2292b4ff439f0910131e2c8d0b1
font_01_sfnt_off00013d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D14 10360 bytes
SHA-256: 549d6062d0736f1725e35652d99d5e577fc8522e3ba1d31292ac1ab7abcd756a

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