Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8e63aff526e621…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 20:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e7d54122739a09d9ec9c2f5a910f8d4b SHA-1: 12b05dd293b7f400a5da9c1af009c717823ebbef SHA-256: df8e63aff526e6216510f74d8bbec29e5a00297cf11fea1cfb9e4f405ed93706
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://at2-turbo-j3t.com/contents/files/davibasadikoki.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/594af27a50d82046698c7d4dea6fe07b/65965189730.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/18762635792.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tukibuvamodazasedezotubak.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/xezofa.pdfIn PDF document text
    • https://davnosti.ru/upload/9123994001.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/68724433978.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/49300139558.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///94491418275.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lelakelima.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/zivit.pdfIn PDF document text
    • http://araonline.hu/uploads/file/69164439007.pdfIn PDF document text
    • http://erex.hu/upload/file/2943282109.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140d9b411ec2---96709939410.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/sosoxebofubuzeguwasefu.pdfIn PDF document text
    • https://dintek.eu/uploads/file/noliwamuxipusagoburot.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/turivozolibitunatijo.pdfIn PDF document text
    • http://atek-ent.com/upload/file/viwutagepewej.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/54458109055.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/katopekupumivul.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/damuzejofevirovixewozajus.pdfIn PDF document text
    • https://istanajp2.com/contents/files/52066212040.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210913081423.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/81346080668.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/85012420742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+psychopath+whisperer+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 18784 bytes
SHA-256: eabb249e26a61a2feb1b12c870dffa053e1a2d6c6d528640dc9f8bc34979a8b8
font_01_sfnt_off00010eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAE 10728 bytes
SHA-256: 52603bc28fac4903c9d91693db8d928b73465456d756272557ca6fa4c3167bd7
font_02_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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