Malicious PDF — malware analysis report

Static analysis result for SHA-256 b732c07d0ca5dc72…

MALICIOUS

PDF

101.6 KB Created: 2021-06-09 09:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6dc4d3d024f1f5603ddfc8d13811b2be SHA-1: ebc537658b679939efb090e61c0b22cbd93a74da SHA-256: b732c07d0ca5dc72aa7b459cdc2af9ef2980fbc0022c9efacc60a1a4ad9aafa9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://catamma.ru/pbw?utm_term=birth+of+kong+comic+online PDF link annotation
    • https://tatemisi.weebly.com/uploads/1/3/4/5/134596356/tazutofibuzim.pdfIn PDF document text
    • https://ratipixudaxixix.weebly.com/uploads/1/3/4/4/134472160/82ee5.pdfIn PDF document text
    • https://vowuzuvave.weebly.com/uploads/1/3/4/8/134884034/4134235.pdfIn PDF document text
    • https://kurajefofukagi.weebly.com/uploads/1/3/4/8/134895289/9145047.pdfIn PDF document text
    • https://vewejefimubi.weebly.com/uploads/1/3/4/1/134108794/2e235a15d92d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7f3ede-b305-40c3-988f-5e1148ded4ac/18249689015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be45c5e-cfe5-476e-9cc2-1120d23a4218/star_wars_piano_sheet_music_advanced.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/xifijutibibegobikiw.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/w/file/fetch/144441933/direction_tricks_in_hindi.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/f/10_oraciones_simples_y_5_compuestas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5bd353-a4e9-479b-acb0-b94c32a01d63/7315390384.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/tepaxozadatudazugabim.pdfIn PDF document text
    • http://zapibibilubo.pbworks.com/w/file/fetch/144621234/libros_de_panadera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12993410-1f0d-4ccd-887a-20deb50cbc16/manual_reloj_casio_ae-1300wh.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/how_to_force_defrost_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5613d403-6970-4487-b2bb-763e30b8acdd/polytune_2_mini_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57527eb0-1b5f-47a9-baef-2223187d8638/45937369091.pdfIn PDF document text
    • http://fisagibop.pbworks.com/f/32561416914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29992e1f-dcd6-41b4-9557-b1897724b451/free_printable_alphabet_handwriting_practice_sheets.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/30050319288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ed6662e-0b46-4d56-9a51-f2dbc223873a/merrill_corporation_business_cards_century_21.pdfIn PDF document text
    • http://joraxakegeg.pbworks.com/w/file/fetch/144576432/how_to_set_up_a_trust_wireless_keyboard.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 6476 bytes
SHA-256: b29522ecce701303f35df2b3134d0735d8eb7f51c5f01c6bdba126fc330434ee
font_01_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 5020 bytes
SHA-256: 9a1cdf32c1ecd77e216dc922609a33b0cb90b7583d6314cebc58f2c5025b6128
font_02_sfnt_off00014b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B48 11416 bytes
SHA-256: c0b58bf85e401b06879c789d32f65d62586e900842be0a2438b006c53d210f9f
font_03_sfnt_off00017169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17169 16164 bytes
SHA-256: 1f773c7a7450f03bde076cc55d70989549729bf7b3b780ce5eaadefca762edb6