Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba84c7109a6694e2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-16 20:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b16f509e773d9665ef2bf0eebf02901 SHA-1: 36962e2de560a7f3a948085d258b526ec71c5e2e SHA-256: ba84c7109a6694e2fa1ae0451a0d3e71c83d7c120b5a2c97b7d2db93ef1ef7bd
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 and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://laborke.ru/uplcv?utm_term=converter+video+pro+apk PDF link annotation
    • http://stavo-bazar.cz/userfiles/file/kiwotopaxonadaja.pdfIn PDF document text
    • http://come2menorca.com/images/file/denitorumudexosixafonilap.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jawewobuxegojer.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/44227070431.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/75231557738.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/maxitapon.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/80111295118.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/74702632170.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/dizepeb.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/51135369440.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zakozuxarinesu.pdfIn PDF document text
    • http://sparkpro.lv/content/file/28693439454.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/wenulewefaxemigej.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/9453332243.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109050327458274.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/pepovika.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/80986086675.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/74516189692.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/33445932269.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jodiz.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98163803175.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210907202440.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/44609512715.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911031104_1gem6a.pdfIn PDF document text
    • 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_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 10360 bytes
SHA-256: 8754aa044bbbce99c367911099ae9922fa2bdebe2764b9e86dbde46dd4677d9e
font_01_sfnt_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 17160 bytes
SHA-256: 7f5de2e764daa1e9d04008c59e9138e9b134a7eb995bf003b1f2e42caa23c46c
font_02_sfnt_off000105a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1