Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1ab0e600416f85…

MALICIOUS

PDF

89.4 KB Created: 2021-05-22 05:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5311916867557bdf18633427f4811a7 SHA-1: ebbeda29c0b89aa94c9fe04e895f0e15115bb7c8 SHA-256: 7d1ab0e600416f85f7f187465591deb0db22396a5378bac3458e250e3e7d0543
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 0.9990

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=baixar+gta+san+andreas+para+pc+fraco+pelo+utorrent PDF link annotation
    • https://mawegovif.weebly.com/uploads/1/3/5/3/135319367/7759677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_602ad44446604.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/nunodubajesizi-naxupu-riwepoxaviwuw.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/kizogatezoz-paluratigol-dozuj-xawemavudogena.pdfIn PDF document text
    • https://ronumotesagazuw.weebly.com/uploads/1/3/4/3/134373959/15e714bb2bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_6022234706670.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/138ffaf.pdfIn PDF document text
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/nadujodivewon.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/5b8b848653.pdfIn PDF document text
    • https://filuwanukolo.weebly.com/uploads/1/3/4/8/134874182/buvuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485004/normal_6043df447a3c3.pdfIn PDF document text
    • https://torejijifixoni.weebly.com/uploads/1/3/5/3/135335296/172181.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://s3.amazonaws.com/bogijexu/63955767762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd55773-3bd5-40d6-b74a-1efcb592a496/togizimuxifezudo.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/online_fax_cover_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b73658-aa36-4c1b-adee-ca3518d029c9/how_to_fix_no_sound_on_vizio_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/muvalofazaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6761f153-aa67-47a2-a548-81e34ca6d2b8/5135734017.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/vikazonapagewibuwexun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959551b7-e8ba-4636-8dce-210af5736a5b/vita_spa_error_codes_flo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c9ee97-203c-4a3c-a702-5c7630841a45/jebarogefatanijafibofamip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1590a25-adf0-4111-8f8a-b4e814c7626b/56706793351.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011f58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11F58 22780 bytes
SHA-256: 927b8f60a25ebe1fde7baf919633d3f5c30e5d0526248e716e17907e5ecc2689
font_00_sfnt_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 5320 bytes
SHA-256: 30226f6729b7f177be5fde05b44a18f0fd411188d3b45915e14efbdbb8b18a75
font_01_sfnt_off0000f6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C3 13096 bytes
SHA-256: 2924548b3da85768e98b4cec3de554b9ac751908e3f84a434fe260f9d9a35768
font_03_sfnt_off0001472b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230