Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a1452935d682b6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 20:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bd4b4131df2277b723b1ff97aad3240 SHA-1: 501710c97caf7e218db6856b60c256469510bbbb SHA-256: 33a1452935d682b6e667dcbe229a1d4fafe7871083ebb617754f981bd8d57ca4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ykzn8.com/upfiles/editor/files/29799229860.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e936959f5---62521806523.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/89743866531.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911084637.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/vebitejirikisuxojiwexaw.pdfIn PDF document text
    • http://vtaky.sk/media/file/8981266302.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/90315454320.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • https://kimcert.org/E/file/55791858676.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pegoxobodopaxorojigav.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/vipemudaw.pdfIn PDF document text
    • http://huefpdf.org/upload/file/51251494409.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/tiwewenodidetizimejoji.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/26648388250.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/78861240455.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sigazederemuseda.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zawalo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/rixuwut.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210907_B4B26044D64361F1.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43544494333.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/41594689523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=money+cheat+code+gta+5+ps4+story+modePDF 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_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 17660 bytes
SHA-256: 8d0b80d74862382039889afabecb576042299811337a1c74750a4c7585dbe28e
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 11140 bytes
SHA-256: 8ac33b45403a6179d51f58b8c88ddefc27c3ea77b282222c3aa5e4d977ab179e

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