Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4cb6babc6b8aa0…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 10:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6ac597612ef4722f9301520f2c544f24 SHA-1: 113081f395071f78a3a7ab6817d124840d0f63c3 SHA-256: ef4cb6babc6b8aa024a1c0fe48a7278b45a3370b9e2ae2c6c723952c1cf94876
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. This suggests the document is part of a link farm, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/wix?keyword=way+maker+spanish+lyrics+sarai PDF link annotation
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/241815.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_6009553d4c8c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_6021d5536b030.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/VWtjjjd/kudovadigesupuribiluv.pdfIn PDF document text
    • https://cdn.sqhk.co/jibezilesu/pjgjiia/bajalodufifunexuwavok.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/9b9da22ea81407b.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/EhjBOje/62664221663.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/hfggDjb/screen_stream_mirroring_for_iphone.pdfIn PDF document text
    • https://xegoratan.weebly.com/uploads/1/3/2/7/132712572/2067715.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/ieiaMw9/vidisadadowejisepagu.pdfIn PDF document text
    • https://kamapapidez.weebly.com/uploads/1/3/5/9/135962567/tojewoleso.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/1f7dd5a1-2efe-4a58-b5a6-41c687d9f262/73810602721.pdfIn PDF document text
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_5ab364f7d3bd473e9d893f0431d6832a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/39643dde-c88b-45fe-af88-5476c2287cb4/cules_son_los_tres_tipos_de_investigacin_cientfica.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_ad4c1a7dfafd4d3cbb7d1fb588bf98b7.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_56d541ac697841cfb237fbb1687831e1.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_a9e309ac77cb40a5901a2d47981bcd65.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_b5e39a5ecccb43d191532f3e3233f7b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9094589f-4653-4807-8029-5ccf14b85748/list_of_spell_books_skyrim.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_8276528a6c944a0e85b0399e1d73f91a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 5352 bytes
SHA-256: 1fffc0f77ef1a9bdda95bf9a6c323d9b5f1dc87e9b2cee17854405cba79027f0
font_01_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 11684 bytes
SHA-256: 4c2effd7403554fecef53df3445b965bfbd99682151eda221751ed15398d8d97