Malicious PDF — malware analysis report

Static analysis result for SHA-256 936e73f1a56f8a9d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-24 06:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9435e5538b22615dabefcc52c121461d SHA-1: b95974661e4427902422b3ac33292e7443d07d30 SHA-256: 936e73f1a56f8a9d63032c27e68c1de6159e23c6a9d2b2e7e258249730b6128b
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 ClamAV detection and ML classifier 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://queure.ru/uplcv?utm_term=how+do+i+sync+my+old+phone+to+my+new+phone PDF link annotation
    • http://modaxch.com/userfiles/files/19876328215.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/retujuzulofuremiweter.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/dorupugadolugapudifa.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/17973181824.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/2030055576.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/19744190853.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/95019956982.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/talujudiwirixuf.pdfIn PDF document text
    • http://zenithmetals.com/files/magaw.pdfIn PDF document text
    • http://grimastone.ru/files/13206636606.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/risejutimumez.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/11662936459.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/57850845250.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/11614283892.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/goronem.pdfIn PDF document text
    • http://bjjiffy.com/upload/12967735750.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/79732445826.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/wavif.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388d953972d---bofowiboluxufemoxo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/84707877389.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210924_6A3025A72A864127.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/mulogowesigelon.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/65397291501.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/51199076417.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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 10708 bytes
SHA-256: 465fe9193b9e68098bdeea3b3da9c972dbf9fc495a1c2b9a0ce6bf89517f2c60
font_02_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 16276 bytes
SHA-256: c39177954a3f83b4e3dd372bc9d389ab14433b2549c1ad468cfc84cf783c95e3

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