Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01f241ba0f93ad4…

MALICIOUS

PDF

71.1 KB Created: 2021-09-09 09:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61245f624d49273bec52dd45a15d3fc5 SHA-1: 74cee60a5cc6160bed69c551a4b7f6f887bde5b1 SHA-256: f01f241ba0f93ad48f0cb092728718ef7a986ff671b5506e40b82885b723f124
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including one identified as an algorithmically-generated URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload. The presence of JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rheinmotel.com/userfiles/file/38522518636.pdf In PDF document text
    • https://equinox-e.com/upload/UserFiles/file/84901491483.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd34731762436ff9618ff4ae7f49cebd/mubazabakogemu.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/39833059158.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/28304094938.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/nulerojozapize.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/rixixezotafowosejusozas.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/mopivavegaxovokavegagosim.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/95097181985.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/15269759418.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42312428237.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/24618484372.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/3314134397.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/1930335930.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/85785131916.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/65296635084.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/xujowopixumom.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/70111552871.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/nukozixoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=social+ills+listPDF 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_off0000b8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CA 15820 bytes
SHA-256: 5814030159d9052278843809849aae567ccbdbd8978ca099721898ecdb43120a
font_01_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 9964 bytes
SHA-256: 945a654a93a79070884845a40a6a1a4fc698aa279f13385a8a504adaf8438a7e

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