Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48b945492c212bf…

MALICIOUS

PDF

76.8 KB Created: 2021-02-24 21:52:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 96f409b6f7617df7a32b414f1cfca4e5 SHA-1: 8a0a4493dd0ecef9991542eada96e644abd2a4f3 SHA-256: b48b945492c212bff9a0f7a54b245fd4de463cacdda95785ce93057b57997f7a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to disposable domains and are likely part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the heuristic PDF_SEO_LINK_FARM suggest the document's primary purpose is to redirect users to potentially malicious or spam-related content, masquerading as legitimate manuals.

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://bologen.ru/wix?keyword=denon+avr+591+manual PDF link annotation
    • http://avit0.cc/noduvokilodatidowasejbw9hz.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/Pgejhge/paypal_business_send_invoices_and_track_sales.pdfIn PDF document text
    • http://easterthjg.com/aviator_watch_avw7770g59_user_manual7tepz.pdfIn PDF document text
    • https://cdn.sqhk.co/nujekezitifi/yiaYTHE/flix_movies_apk.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/blue_jackets_schedule_2019.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/siwuxujububazaribaraketoz.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/4195042.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/sutazebul.pdfIn PDF document text
    • http://crispyset.online/65736634410jl7ys.pdfIn PDF document text
    • https://rikekipodoze.weebly.com/uploads/1/3/0/7/130776447/b3810b849b5c.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/xhgJxvp/lovecraft_country_trailer_2_song.pdfIn PDF document text
    • http://pogadai.xyz/gazadolunekafizijesegolxbu6.pdfIn PDF document text
    • https://cdn.sqhk.co/jazorawa/gegchcr/billie_eilish_lyrics_i_love_you.pdfIn PDF document text
    • http://subbellassecret.com/76398801828ngxi1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxiruvud.myartsonline.com/vitamix_5200_blender.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 5044 bytes
SHA-256: f4ae2fdd24b7fae7f808a82c80737348aaec88bf70dcefb52ce31f4abaae2682
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 11428 bytes
SHA-256: c703a6366cacd7da340553ef06c0e7458e5ced13dd8f2fde969732bbb650343e

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