Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad59faf889fe6479…

MALICIOUS

PDF

99.2 KB Created: 2021-09-20 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5ca2941dc14914519833474a36c7f1a SHA-1: 7ff1beeaae0862e38bf3292dac021166d6e9e4a6 SHA-256: ad59faf889fe647984c182427cb1d32f05473ce9d790ea279ef5a8ce0ed49704
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for initiating the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://gz-theoutfit.com/UploadFiles/FCKeditor/20210908120919.pdf In PDF document text
    • http://tai-group.com/upload/files/73795577086.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109122346469410.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/33433618752.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/ruliwowenopatenipasub.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399cdd1df1d---bagizajegemilazelez.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/5052236373.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/kigukowedejatatalevorexon.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/madidevetutavugijam.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/58803531325.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/69719461408.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/62378159540.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/bidifogabogonaru.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/44581033564.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/37bc1fe524224ff1bab8638988209fc7/90176825496.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/41827705541.pdfIn PDF document text
    • http://kd-council.com/upfile/files/51506286254.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/27747578166.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/lasezawagaki.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/litakobemalizutowilofovug.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/pematumuf.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/datelolipamu.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/salibakuroxuvabolawu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41853511343.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/texisorevurarugulanad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+convert+doc+to+pdf+in+android+programmaticallyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 18232 bytes
SHA-256: 5f5f7abf284e6f4daf3d3a263b19bd11a06e734061a2b599408adf59d17faf93
font_02_sfnt_off00014f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F47 11052 bytes
SHA-256: bfee10b6a8b2af8f36934ce55e90bb844bd1da4cb2fbee4c9e72cf2640b5ac9a
font_03_sfnt_off000168cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CC 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f