Malicious PDF — malware analysis report

Static analysis result for SHA-256 f202b53390f26c4f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 12:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 36c08f162a61af4cd04acb6cc3c492b9 SHA-1: d4ce30398e4ab549d437da6c27311e0996ec438d SHA-256: f202b53390f26c4f80a725869e573841da66aec697a785734df2e2a38e2f353e
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 that point to link farms and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate structure for hosting many links. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=mi+call+recorder+apk+download PDF link annotation
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/fifulaperaxuxubadaf.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/jetulutifiwobewavap.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/megesajo.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/bubapibogodejidapelerined.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/6319560407.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb04df4f79b97391b8eec4e5bd0c536f/75641930835.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/50503146695.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/92710215522.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/teziluvoj.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/34863700360.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/58025463394.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/64705179771.pdfIn PDF document text
    • http://arablift.net/userfiles/file/zetalezubenidumo.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/65549960659.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/58805926340.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/91056358056.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/51400427080.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210909064922.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/79095155985.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/18418193814.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/sajujelonodo.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/legozezomujexetafiwer.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/33734904157.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/raxaxegozeb.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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 15240 bytes
SHA-256: d3801f340d7fe8754efba9bef0e16842efbd129eaa17981cfce8ff9563ad8447
font_01_sfnt_off0000d880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 10412 bytes
SHA-256: e0a87f2c74a8c8b5c40cba5f2ac0b03b707a071aaec86c0d8be59e07db1d9fd4