Malicious PDF — malware analysis report

Static analysis result for SHA-256 b547e521767f7732…

MALICIOUS

PDF

71.3 KB Created: 2021-09-21 04:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86f774bb3a85ab12957cf7930acd8005 SHA-1: aa34cff2d553b6f8da9f6499aaf9061beb55ef13 SHA-256: b547e521767f7732e8302ba01c94065ac9ca0205a8fa740ab247d8dcdc289d2c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are linked to disposable hosting. 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 initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=facebook+messenger+video+call+android PDF link annotation
    • http://bachtungcompany.com/upload/files/xoputuj.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/50368311881.pdfIn PDF document text
    • http://air-ned.com/uploads/files/sarasifuvazekejajexafi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cee639337---65439772516.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/93666506039.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309924279515.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/6228649073.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/79804701504.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jisalena.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/37610236087.pdfIn PDF document text
    • https://bor-diing.com/upload/files/38270239978.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/83742431228.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/32658219551.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/71552886887.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gavilazitef.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/64764954974.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/vefatijitedumuxunurodonix.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/15087875335.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/javitebogusure.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/1058302149.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/wakedav.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/99895254119.pdfIn PDF document text
    • http://nova-auto.com/upload/18622749636.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143326b1c07c---nalilerawopidivagitufego.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_off0000b7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BE 10892 bytes
SHA-256: 7147e19689b02d186ce08122556952a2aa3332abd0b971eb6d832057b785a533
font_01_sfnt_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 15284 bytes
SHA-256: 181fb1107408d2a3784866c14e043d376cee5a9d6ca1012a5981a02519111def