Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc63ca85e0bd204…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 04:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8a635870184f435931df2177f6aa3a82 SHA-1: 60c2370cbafd9ea89638c2e6c3d391f3a4a01812 SHA-256: 6cc63ca85e0bd204fcbfad93ccaa9c422205ce7b2baf26a4b84212d44cf415f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a large number of external links hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=mod+car+parking+apk PDF link annotation
    • https://ceramicasvillaflor.cl/UserFiles/File/21829880515.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/pifidiriluxunuzos.pdfIn PDF document text
    • http://ccsl.asia/files/39114530844.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3455b1e9---kotafiga.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/37952083019.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/zegora.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/32691292524.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/xajomepezomutufeligumi.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/90588587008.pdfIn PDF document text
    • https://etadelloro.it/images/file/58360176298.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/lemuz.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/75424388397.pdfIn PDF document text
    • http://crm333.com/documentos/file/katixate.pdfIn PDF document text
    • http://chemsdano.com/upload/files/45160596475.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/9512377840.pdfIn PDF document text
    • https://huanghecables.com/d/files/watevisolaranu.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/87713435530.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sifilusoxosati.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/lidokix.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/piminakijok.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/16695671670.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b6cbd1c6---fetozavagetaxukojimasikes.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/mopekavaxegukivarorebe.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/geveluzosujegosofowope.pdfIn PDF document text
    • http://billsky.ee/files/file/70191899700.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_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 10328 bytes
SHA-256: 5aa6417bfe41fb3a99fa387c93ab49a16920ecc717a2317cfb7eaff29bd7e7ad
font_02_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 18104 bytes
SHA-256: 8f0bbcb5a51cd5eac85fcfa421418e598ec8807ce09374f10311f4a11192e505