Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87d00c0115daa2f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-30 19:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c972ead4fc1db73ea6745d916a940fb SHA-1: 4edd928064ec9bbba778ff0bf4ce53e93931c905 SHA-256: a87d00c0115daa2ff02450ac9679a4b28af04ece0310222a1229820b9d0ae986
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings point to the PDF acting as a link farm, with numerous external URIs pointing to potentially malicious or disposable domains. While no scripts were directly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xdata.pl/app/webroot/img/ckf/files/sonilobofazus.pdf In PDF document text
    • http://insureavisitor.com/userfiles/file/41596871074.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/sugigupam.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/gemija.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2d3d6065a---55711245384.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cae110b0ca---3633519128.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/89062986541.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/24415583557.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/56576946839.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/73715678037.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/regotafagoxotelufolunido.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/19853163302.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/lorokepev.pdfIn PDF document text
    • https://cargotavio.ru/files/file/26097617817.pdfIn PDF document text
    • http://gibisch.org/files/files/buziziveta.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/16286290929.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/wonifaza.pdfIn PDF document text
    • http://centronegozi.com/public/pesipinabetesoxatilowoze.pdfIn PDF document text
    • http://ahknchem.com/upload/files/ruramopen.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/21938889636.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/galafipotapenu.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/judofanijufewo.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/fefoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=justice+league+snyder+cut+sub+espPDF 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_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 18848 bytes
SHA-256: 54f6299e5b6d94f6a0bf03beba908d5da280eed707583bac1407de401350be84
font_01_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 10916 bytes
SHA-256: ff264616faaeba2f1c88b8b2c908c473d5d6506664ae00ebf0c76471d9bba475
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1