Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b41e133a2e1290b…

MALICIOUS

PDF

73.7 KB Created: 2021-03-29 16:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2d976958ee7ac9f85e476645037867d5 SHA-1: 951baa846087ee52e5515c03870dd406ce2849b0 SHA-256: 7b41e133a2e1290bafa09d90fbd269d71a6953dd932c7f7afd8cee8fdb5fcc94
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 0.9999

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://xajibur.ru/wix?keyword=superman+games+unblocked+at+school PDF link annotation
    • http://nidewopovuwubo.mypressonline.com/gastrulation_in_frog_and_chick.pdfIn PDF document text
    • https://jimutovila.weebly.com/uploads/1/3/1/8/131856698/3787443.pdfIn PDF document text
    • http://tilikef.mygamesonline.org/49405178816.pdfIn PDF document text
    • http://webmastervlad.ru/fovobuzirepamabulobygnf.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/nejukukomabenexebud.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/mewuwulofiga.pdfIn PDF document text
    • http://yourbigdick.space/sevuwoguvekusonupetakaxwmbso.pdfIn PDF document text
    • http://sq11mini.com/1360777632n4osd.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/82746763183.pdfIn PDF document text
    • http://dududuw.mypressonline.com/wuzejuzunomixadofovupefo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_cebfad0f3b8142c09e9c812b4406139b.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_2b8d71844b2c47c6a5240fb28b99940e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kisagoz/antivirus_for_laptop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/mcgraw_hill_education_textbooks_answers.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_86de476e17774c108d347d152c5813e4.pdf?index=trueIn PDF document text
    • https://bbf05351-1c49-455c-8ea8-df349977a4d5.filesusr.com/ugd/15c6d6_39a667ef9b3d428f8ce9851cd1fd5d14.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_d8d201fc78534d7c9f1217330841a340.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_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 5796 bytes
SHA-256: 9aa6187d5b0958e263679eb62365fedd5073fe4a2202b6e840b11aac9bacf92e
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 11320 bytes
SHA-256: 8ce606c553994e21d59f915d31de05a4376b1ec3438571666fdd06b8cc14b0d1

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