Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac9f029ad398e21…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 23:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: babafc224c0197c000638424358a0b00 SHA-1: 70f5d93a3ddb44903026a0429bc8a0c5bd1548f4 SHA-256: cac9f029ad398e21f6aa515d02f0b49da505224bc5fc4c6f100cd369dabf7bca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://styrexon.cz/userfiles/file/witumolijutogiwa.pdf In PDF document text
    • https://tranhtreo.com/images/ckeditor/files/lonawu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1377c1ed---vofawubatotozajadefaso.pdfIn PDF document text
    • http://yuha.be/_files/file/75552742562.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///76557001531.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/lapiwef.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db72f91761b13334ab1bfc3de07dbbf4/42261552926.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/pipexaf.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/jidaxumefa.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/borojonibuvomuxaw.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/27858795880.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/bizebipibagowisuwele.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631189875.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/13709484553.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/towikofolamovadopozaku.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/ponibuvoritujoxunigaxuwi.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/72234361335.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/lajiterigopimuvani.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210905_090501_1920.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/1097175415.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/bafemozokomel.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23325836572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=why+ios+over+androidPDF 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_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 17120 bytes
SHA-256: 02cc7e20af545dc1ad6041e3329838b7c02afaf1359244987ae4200bea426354
font_02_sfnt_off00011b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10376 bytes
SHA-256: b324a3dccd45dc60f2d179770dc54ec62bff77a99088593d4d436a79c973a1a1

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