Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25dbcf4d2600bd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 15:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 52f1bfa681cc069abed7675ceee6c3f0 SHA-1: c58397c2ff3fc72fba9801b455f192f9782135d8 SHA-256: 4b25dbcf4d2600bd716f91690990fb4984b3d27322e1134aca591e9fd34a1a2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gccde.com/downloads/blog/geust/files/majumamumunijijaromiwalo.pdf In PDF document text
    • http://vector-mebel.ru/uploads/files/31674373203.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210905200426.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wegupoboribunemurame.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/sopesamaxafodamotu.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/serokodemexajepotamemux.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/zijobez.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/81931105392.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/joxasuwedazolos.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fa809386---mosafinifodaw.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613176064cba9---dugubixozozos.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/tiwifagexu.pdfIn PDF document text
    • http://zatacorp.com/upload/files/palofun.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tagopovozak.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/82849989896.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/govaridulosoxul.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/74781625445.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/kunev.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/kezavavubopumelejubus.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/29673441063.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58079810091.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/94073132739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+5+mobile+apk+free+download+no+verificationPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 11168 bytes
SHA-256: 862b96cad01eded7e534d8cc621ba7bac1f6c5a8db99a1e0954054343d3295ae
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 17888 bytes
SHA-256: bf640e9d5292a085a8a9ebacda4b71971b7a10211f93d754767ca39f0d6b6323
font_02_sfnt_off0001278a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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