Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd062c5c23a3452f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 01:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 148d7e1f8551a460cc14a88045c3a09f SHA-1: 0265d6716e74cd273a8d41a44a1968d1d9a48c9c SHA-256: cd062c5c23a3452f2fb7c295e913cc1abf324486aab02428e902ffe043948158
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=study+guide+world+war+1 PDF link annotation
    • http://svoytrylend.xyz/calligraphy_fonts_for_mac_freesythg.pdfIn PDF document text
    • http://domainlimax.xyz/para_que_sirve_la_moringa_semillac30t6.pdfIn PDF document text
    • https://genexezo.weebly.com/uploads/1/3/4/6/134616565/fozobinim-zawofufusas.pdfIn PDF document text
    • https://wozizagozesa.weebly.com/uploads/1/3/4/8/134848764/xuwaxivepupu-kogitefixubopi.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/fidal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5fe82c87bd324.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/79088977782982g5.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/f54abacc56.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/nepibozoxolufikam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453579/normal_602e3de0210bb.pdfIn PDF document text
    • https://tinozewadewuxa.weebly.com/uploads/1/3/1/3/131398338/9829509.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390374/normal_5ff7150da55c1.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/90b0e8548c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600aad24e0746.pdfIn PDF document text
    • http://instup.xyz/love_feeling_video_songs_free_mp4fbq4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 5164 bytes
SHA-256: cc2055b36dd196715d247662a1abb89712d30fed8b00cb56cf3c19505e25f970
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 10520 bytes
SHA-256: d93a88326506df16fa7d23a5f8b8715dd31080e1424a014a847383f8bd988fac

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