Malicious PDF — malware analysis report

Static analysis result for SHA-256 f539d193fceac088…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 11:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 70748f14ec9d1be342c101932cfe0fe0 SHA-1: 86c9ea5defd77c1971bdc20d704be411d329af15 SHA-256: f539d193fceac08819c1a42ff18f7a27dde8c790b72840debeaae4881d88e350
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is used to distribute links to disposable hosting. No scripts were extracted, but the presence of external URIs and the link farm heuristic point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bajajsports.com/userfiles/file/4154963618.pdf In PDF document text
    • http://www.rajpuc.pl/pics/file/xebubazezozexafised.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/bupumasodived.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/52110432567.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/43133707095.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/tomexadisumew.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/xuzimamezabegik.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/dewutelapemox.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/80018119703.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/lezivunawefubaz.pdfIn PDF document text
    • http://szpk.hu/_user/file/2674317148.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d69f08f3d---sopuniwuwev.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/libiludoxuvogalat.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/dobujomexabifimob.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/13751849013.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/wufuvagizumokisewasibeja.pdfIn PDF document text
    • http://reflita.lt/uploads/files/vuzok.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/babaraxuri.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/54755422093.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/59270842354.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/53138808316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pubg+full+apk+highly+compressedPDF 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_off0000b250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB250 16568 bytes
SHA-256: 76256f75ba06d13e95e5a4d4408620e66cd7baf355f18638b87632ceb5cf738e
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 11312 bytes
SHA-256: b4ca2706dccd388d1ed9fa90dce07d1a7ede81677e084953d4699e504c66295d
font_02_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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