Malicious PDF — malware analysis report

Static analysis result for SHA-256 67858e24c06cd462…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 10:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cdbb57f14fcf70f7e6eeb7c7943c85ca SHA-1: 367a04044dd43fdd8975048ee4bd5685f2099ce1 SHA-256: 67858e24c06cd46233f35a9a71fd484c0dfc59b533543fb35d61d105a3d89226
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CLICKFIX' heuristic suggests the document employs social engineering tactics to prompt the user to execute commands, likely to download and run a secondary payload. No scripts were extracted, but the presence of numerous external URLs and the ClickFix heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://archism.ru/uplcv?utm_term=trasferire+dati+da+android+a+mac PDF link annotation
    • https://burkina-businessschool.com/business_school/uploads/file/sipera.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906042938_327400010.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/legisubug.pdfIn PDF document text
    • https://atlantidegattico.it/file/19477744564.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/nawubomijebi.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/57258729925.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/sivamofexojasimeselu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • http://berbun.com/user_img/file/32660027183.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/58131443294.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/xizasimosametejiramamiwi.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/81856405818.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/41361755805.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/a114a9d54dddf82e206a305b19a870ee.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec10abf9fc---xajegotajivifimivu.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/46775267242.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/sanegowogigukupanadub.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/nalibarozede.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/34359739584.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/zowasu.pdfIn PDF document text
    • https://defi128.com/userfiles/files/10746392950.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/41272722291.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/99298042430.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b5e1ba4---nimulopitikakotupokug.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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 17488 bytes
SHA-256: 6fa5f836b975c3134303254881cb43ac4df44529ba964060291eb45a3e71139c
font_01_sfnt_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C6 10552 bytes
SHA-256: 3aff08faceaf52663a1279da6ccf895c83d5e743cd0aade21c24d30172489a65