Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcde37f8ca5ead4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 07:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 30173436da2fd9f0b1b820bf375c0904 SHA-1: 8b07a1b5237eacd2977201b5b58cf74b2221d0a4 SHA-256: ffcde37f8ca5ead426a51eef1e94aed8e6800b9bce93cbcfa6e0cae24701f402
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a creation date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/award?keyword=what+size+bullet+does+an+ar-15+shoot PDF link annotation
    • http://buyervannakupitvsem.xyz/php_secure_rest_api_githubftdyk.pdfIn PDF document text
    • http://istlan.space/35071751609n23p8.pdfIn PDF document text
    • http://megatorg.ru/71249112310ox5ms.pdfIn PDF document text
    • http://dombitarf.ru/think_social_psychology_2012_editionc1sp9.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/femavesijafabusoridemaw.pdfIn PDF document text
    • http://bonboxstudio.com/winrar_windows_10_32_bit_freewlhbe.pdfIn PDF document text
    • http://detonicufficiale.website/ballade_n_1_chopinsjt9l.pdfIn PDF document text
    • https://cdn.sqhk.co/jedelamodafa/jgeshhH/70009769618.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/gosex.pdfIn PDF document text
    • https://cdn.sqhk.co/sulezudipozi/ejficLr/bapasegisedub.pdfIn PDF document text
    • http://wikatugakuvifi.iblogger.org/us_citizenship_test_2019_one_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/xajimujigaju/cMlidhb/funny_soccer_physics_3d_mod_apk.pdfIn PDF document text
    • http://white-x.fun/wisconsin_badgers_football_schedule_2018rwcck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/plantronics_cs510_wireless_headset_user_guide.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/pajevatokuj.pdfIn PDF document text
    • http://fezesotufixodow.epizy.com/9587795867.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5324 bytes
SHA-256: bd54f05a3c84ca43888789b304136547ea3ca036f42d53a927bebad14d074da1
font_01_sfnt_off0000fbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF4 10668 bytes
SHA-256: 000f7c7db1f0d9200a6f5de50a7e91b9fc2a5903abaae8924a9add7594cc3968

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