Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3fa77bb0936ec4…

MALICIOUS

PDF

113.8 KB Created: 2021-03-14 08:37:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef7f5aed16dd1da3120347277a22a07a SHA-1: 619ffe5c48fb77b5e0f75266ecdaf951d1a80635 SHA-256: bb3fa77bb0936ec4e295ddea15c41ab1f6859ea9e9464ca2a8593ed4eedaaa73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://dafemum.ru/award?keyword=glossary+of+banking+terms+pdf PDF link annotation
    • http://opensalon.xyz/27575757430e7f5c.pdfIn PDF document text
    • http://summ-green.fun/andromeda_strain_movie_poster2enh1.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/ayFbiju/baby_alive_grow_up_doll_accessories.pdfIn PDF document text
    • http://ita-talia.fun/9911424269579ol0.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/yasin_dua.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/dh9gchh/john_travolta_bubble_boy_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/ihnjbgg/show_my_homework_spelling_test.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/danza_clasica.pdfIn PDF document text
    • https://cdn.sqhk.co/siripeka/jfhjZhg/54771175776.pdfIn PDF document text
    • http://remontvorot24.com/4053882651fc86y.pdfIn PDF document text
    • http://polfact.site/rizakovogovokuwenujolexogjyg39.pdfIn PDF document text
    • http://select-get.top/flir_one_ios_thermal_imaging_camera_for_iphone75ucn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/tobufuxapenamop.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/how_to_bring_miracles_into_your_life.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_96a45d11f2cb46afb1624b4bfd629e64.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_028e066b637845058873828807e72dbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/aisys_anesthesia_machine_service_manual.pdfIn PDF document text
    • http://pimobepetokonud.myartsonline.com/95825632698.pdfIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_25f7c39092784c678dfc31205d470d9d.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_32c7f0825b114c7cb0195ca5bb67acfa.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_off00018071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18071 5700 bytes
SHA-256: e1a0d74c55188a107370b5576b1bcc9692d9cffe9537bddd49a15218e595ea67
font_01_sfnt_off000193d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D6 11228 bytes
SHA-256: 4e7bac9a80fc2ea6696c971b2ddccde10629660eda38a5cb98fadc71fd62166b

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