Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b9a27f3e4cb977…

MALICIOUS

PDF

76.2 KB Created: 2021-03-24 03:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bb1d43279a24e96bb56c87fa6c588c93 SHA-1: b8b8cdc0e37db996e6c5863bf9cc2ba484d588f8 SHA-256: 93b9a27f3e4cb977b71435c76799adeb601ef37dc6bd6b910c33d50a65dfeffd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, 'https://maypoin.ru/strik?utm_term=concise+introduction+to+tonal+harmony+workbook+pdf', is likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=concise+introduction+to+tonal+harmony+workbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fe501b1e5e01.pdfIn PDF document text
    • https://bematurom.weebly.com/uploads/1/3/4/8/134886193/0c29bd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_605a7cafd8a54.pdfIn PDF document text
    • https://fusarutuzazeni.weebly.com/uploads/1/3/5/3/135346017/c3f75f06cd3887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_601dcee95d0e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453550/normal_602c12ae8a84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_6045fa003660c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_60323cdd30979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_604686344e8c2.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/jbHzXig/social_detective_app_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fec4ee49d508.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/cv7jjPP/narcos_cartel_wars_gold_cheat.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/ggehhOk/hoop_heaven_basketball_camp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_603d7e3d05be8.pdfIn PDF document text
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/bf41fc7c1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_cb53152fae814c5f8b53786a763c0f7f.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_f75130d867df4d7aadc49bddd56beec9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/jenatakexugugogojine.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/mobile_broken_glass_wallpaper.pdfIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_01d0312ebcdd40179f18648aa28d2fd6.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_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 5696 bytes
SHA-256: 3dc46957002a8c1ab15be100962c1b960a22ee50fed10c04f14fdf257002eb9b
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 10576 bytes
SHA-256: 980bc72b456a8514c6a40c21cc42688c3ddef242feb6c2b490880a9a0e0081db

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