Malicious PDF — malware analysis report

Static analysis result for SHA-256 800121c10d3ab60f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-13 22:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a42d29b4fab80a47744ce6453c597499 SHA-1: d3457b47b9d55bf70b17a3bbcecd24b608708044 SHA-256: 800121c10d3ab60f2e769f33436cd05fa2c6e0794214757353505122e08da42c
244 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=mtn+laurel+assc+ins+prem In PDF document text
    • https://kifoguwo.weebly.com/uploads/1/3/1/3/131383532/mewizibula_vuzadefobek_dipanali.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/2601520.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/h3ZogAR/48794214396.pdfIn PDF document text
    • https://gemaxapofa.weebly.com/uploads/1/3/2/6/132681544/943982.pdfIn PDF document text
    • https://cdn.sqhk.co/loxosefivipo/35tgjoG/71634992072.pdfIn PDF document text
    • https://nurekagenarufab.weebly.com/uploads/1/3/1/6/131636906/5168349.pdfIn PDF document text
    • https://gewewipuno.weebly.com/uploads/1/3/0/7/130775766/5529563.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/8e59cd8f8.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/8485fa3b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobisijukufoki.epizy.com/nuroxoretuli.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_e516d5f1ef754fc29c9f8625c78d8efa.pdf?index=trueIn PDF document text
    • http://vosolapigufax.epizy.com/report_fault_on_phone_line_sky.pdfIn PDF document text
    • http://lidufaz.epizy.com/coniugazione_del_verbo_chiamare_forma_passiva.pdfIn PDF document text
    • http://kojomazudogog.epizy.com/real_anaconda_snake_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/navy_marine_corps_commendation_medal_citation_template.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_0bbb43ec036542e3bf59b565ea52a5fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/how_much_does_a_criminal_defense_lawyer_make_a_year.pdfIn PDF document text
    • http://gasukexopesifu.epizy.com/56012462645.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/how_to_do_a_coordinate_plane.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5084 bytes
SHA-256: 85709cda3e994e0f02fdaed65e6ced56caf1e7cba2bbd55c24d9ba18b3173a5f
font_01_sfnt_off0000f9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B1 3148 bytes
SHA-256: 1034d2fb1cfa93f3a82399f72ac9f4691508c3be121c76e3a44b9a79f74a0b08
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 10852 bytes
SHA-256: 0cd800697692d2b432efa1fb84678626798790b2b8b84e15902e7c3add937325

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