Malicious PDF — malware analysis report

Static analysis result for SHA-256 9887276b6cd67a09…

MALICIOUS

PDF

73.9 KB Created: 2021-03-24 14:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6915a37a5d0d4b063a66c1c3b947c053 SHA-1: 6cbb5edcf2a4b1bfc68fcfc2128ec07fb47bdcf0 SHA-256: 9887276b6cd67a091ff507a67f741044865de5fb16a6d667074e6a11f29e3772
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing lure by ClamAV and ML classifiers. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. The primary goal appears to be directing users to the malicious URL for credential harvesting or further exploitation.

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://mezovuduw.ru/award?keyword=automatic+conveyor+belt+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd1661bd2566.pdfIn PDF document text
    • http://wordwild-store.com/tuvujedy4erg.pdfIn PDF document text
    • http://avtoshkola-region26.ru/richard_wright_blueprintuil5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5fefb302243b5.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/employment_offer_letter_template_free6scqj.pdfIn PDF document text
    • http://rimka.xyz/632085778626rfh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_600c629e4b191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367311/normal_6006ca6f28b24.pdfIn PDF document text
    • http://unosital.space/476773235700vctw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426410/normal_6020facfe9e39.pdfIn PDF document text
    • http://supernefritroller.xyz/entry_level_software_qa_tester_salary2kj37.pdfIn PDF document text
    • http://com-copyrighit.com/what_do_you_write_in_a_self_appraisal_commentlergz.pdfIn PDF document text
    • http://gnfcns.info/centos_7_ifconfigf9a3y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b38161-0ffb-4c77-b438-8b044ad36e94/77049468548.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/coaching_ontologico.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/roninileramu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96e0c2a-ee8f-463e-bcd1-ccf4b18c116b/34652014737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e36e0f-d665-4301-b7f9-8d6bdd838d90/88387170808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64e55425-c691-409f-bd65-346f204fc009/darume.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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 5592 bytes
SHA-256: 6f8c0010df87df239a68ac679c45ba08a0b246cc6b5d25471828a9bf07160cb8
font_01_sfnt_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 10400 bytes
SHA-256: a39101197e479463c7af3073125d5263e22c78c68ce6c52c51c97a98559dc103

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