Malicious PDF — malware analysis report

Static analysis result for SHA-256 55401fb94f43d89c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 16:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2a270c9211f15bd712735ae63abf683 SHA-1: 06ae9678aa2d93c6a253e5d020cebd9ab4d78bc0 SHA-256: 55401fb94f43d89c0b1faaa6d41ce21a5ba9bce9b4634fa7edadbaed3c2032fa
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of multiple embedded URIs, including one pointing to a raw IP address, suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI findings strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://dnmpaint.com/sdcc/images/file/82235613537.pdf In PDF document text
    • http://generaltubi.com/container/ckfiles/files/zuxinaxogajapozan.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/xamaparixexixe.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/juzifomowi.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/6976536992.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nusisokagijedodijamalab.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/78942864636.pdfIn PDF document text
    • https://emenu.hu/editor_up/14336838302.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/pijanizosof.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/vejodiwejebijuporane.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/mafifefonofesadapesulalup.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/65338052267.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/41406716263.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/56235464622.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/64632798107.pdfIn PDF document text
    • http://fluorescent-training.com/file/94175607766.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/85mbj2ued9jlslg9usm4u0ok1k/gegarux.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/mibagibakasaj.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/37969265196.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/gibewusifelexojujon.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/58738442905.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109090824116759.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/zoguwafotegelezojebiz.pdfPDF link annotation
    • https://laurallo.com/ckfinder/userfiles/files/26445025346.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb9050e653---44752139037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=why+is+my+phone+sending+multiple+messagesPDF 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_off0000d48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 10948 bytes
SHA-256: ffa90e6b4f09007167bcca1e98341b1b43ef4a00400501a147b5b81830bd2ace
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 17920 bytes
SHA-256: aebd270db270b321139ba862442fce8f1e18f355bccceb7c61e164451402f74b
font_02_sfnt_off00011b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1