Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97a5e2fd0adfd57…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 09:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fcfcfdf24d50cf9c775334227ffc919 SHA-1: 25a168f20864f02b32154169f94ff4fe6c40c2ea SHA-256: b97a5e2fd0adfd57b7415630a9e51a42fa86931c7aa5737ed993ee12ef558015
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm with many distinct hosts, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mygoaltv.com/ipp/images/uploads/files/lafiwavunumu.pdf In PDF document text
    • http://dekogard.net/deko/veri/_files/76508523235.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/bonukesovuwow.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/79214452965.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/81917944010.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/22265580798.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/87114017267.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/nalajade.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/woxelizularezagojifajexod.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/dufuravudesilumes.pdfIn PDF document text
    • https://aildf.in/userfiles/file/92931209019.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/sabara.pdfIn PDF document text
    • http://ijfbn.com/editor_up/rigezu.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/vomujixiwebutetoduxi.pdfIn PDF document text
    • https://kuwaitpolyurethane.com/ckfinder/userfiles/files/pisebutugorof.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/23750545641.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/nevozobaromamoju.pdfIn PDF document text
    • https://cityface.cz/res/file/tuvepuwamedamijejewet.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/988321117.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/zesotumaripixo.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/56185980713.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/2783383810.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/11713977431.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/xosazi.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/43663876368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=bendy+in+nightmare+run+apkPDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 20876 bytes
SHA-256: 439477fb87467d4dd87f33bf8121d998219ffa9a478639bdb016d23aed243a62
font_01_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 10864 bytes
SHA-256: 077536ff6eb4670f9d9b5c4eae7b2cf823c93e95d182bf3bf0ae949ed458930a

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