Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b735514e295c5b2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 22:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c3255f76eee1e526aacf0e2c78860d1a SHA-1: 1fb24e17d93c10b72a7456b1bf89a3ee809d9ecc SHA-256: 8b735514e295c5b2a4b3712233f871ef28a9f1b625ab58c4531c06bed16aa2b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable hosts and configured as a link farm, strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaaf19027---xiwujavin.pdf In PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/2452289329.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/jakojekijorukexozaber.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/nijutabatakawikizedipu.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/43388145859.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/wudibetenewebokig.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/31219745857.pdfIn PDF document text
    • http://gro-felix.si/uploads/noliri.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/41666048022.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/wakekiz.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/wuxagirodatubakokewi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/gakalugeti.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/ripap.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/kerisunonuxofonapuferasur.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/65487177540.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/86355749481.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/wanotoxatapobax.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/papemepuz.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/venetogojoje.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fapuxamotuzizusovovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+babysitter+killer+queen+streamingPDF 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_off0000bd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 10988 bytes
SHA-256: 33908d4713fd1fb36e3c20f48bdea92be2b260b48ace49ebe1544d498c0c6be6
font_02_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16788 bytes
SHA-256: 09e465322ae9fa4d0f26c52c9af9a78431c920450663874a94a44f080ee72aab

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