Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb862d10ed9fa526…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 15:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73ee077f784cfad6983763de6b860e75 SHA-1: 3b9a6ecf48ee2db62c50605dd2cdaebdc2e98442 SHA-256: bb862d10ed9fa526e8bdbb9665e64a643728d54ce96eb99a6b0be9f61195c52e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying a link to an algorithmically-generated URL on potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of multiple external links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://iphone-odklep.si/vsebina/kubawumo.pdf In PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/11873146302.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135532a88163---xokajotozikiza.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210909093214.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96070977997.pdfIn PDF document text
    • http://punaide.com/userfiles/files/nolixubigokefisefile.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/televipugovo.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/59204120478.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/jukudunitedu.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58855656806.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e0f0d2eb---nudalavanirovomiluxu.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/tujugodanixolurakevumijuk.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kodamaxabulikem.pdfIn PDF document text
    • http://fluorescent-training.com/file/badixafatezokezewaleju.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910210003536.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/84825240781.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6139e6a7b5f19.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/27779891712.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210907004504.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61369370525.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/92804823033.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/42390259856.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/25492931208.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/32325366677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+setup+mac+mail+on+androidPDF 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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 19660 bytes
SHA-256: bdb4fa8ff2a010bfff7d9ab1a3f95950a5af589b867adda0db34fc787c3886ba
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 10852 bytes
SHA-256: 51b6f78fbf418dfe930cc530084b1abfb6b39e9bd7ca2a915c81006c8742b520
font_02_sfnt_off000133e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1