Malicious PDF — malware analysis report

Static analysis result for SHA-256 394fd171eafd9d2f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 23:30:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 18881f4e4872cf5830b114d6f2a0f133 SHA-1: 7122d26c757f7a62bedd7fc83f25e24c959375c3 SHA-256: 394fd171eafd9d2fe7eb670f096215834838253ef1f2a6370a37f9f4e119a0a8
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs, with a specific focus on SEO manipulation. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/aws?utm_term=what+exercises+build+arm+muscles PDF link annotation
    • https://cdn.sqhk.co/xurajalijok/hdh5ibp/70661164791.pdfIn PDF document text
    • https://cdn.sqhk.co/posiraki/hfahaE9/79942111541.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/2PQcNij/13310315544.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/fazegim.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/f1RibpZ/find_word_cookies_answers.pdfIn PDF document text
    • https://nijexenedol.weebly.com/uploads/1/3/0/9/130969845/tobivemepi.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/LVyiaia/6723815620.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/lugitedajesewukorop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_1d3e72372c9a4875aeb7f0ab2631ec5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/street_stick_fighter_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b73e5ff-4258-4c13-a1e9-b2da5882ddf0/lifezesiwodup.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_34b5baefb30c4873a128a6e8cc1300ff.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_a045714197054c6cab6937cde3d5f89c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/bosch_tassimo_manual_red_spray_light.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/where_do_you_mail_941_without_payment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c38a4a5-f510-464f-9f52-b9592b62cf1b/the_bluest_eye_summary_chapter_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fb414a-2302-453a-b98b-8062864df390/dexesopijobivakowubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ec7f32-3ead-44e9-b43c-37ce7eddc520/christopher_columbus_journal_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/zimobafibogibukonimog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feca5476-febc-4422-87f3-fc13707ce4d9/apple_logic_express_8_system_requirements.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_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 5400 bytes
SHA-256: 3db98bffba4bd0e9cf2b8cdf00b95429bb47abe046e6def348e8c3e02964a489
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10452 bytes
SHA-256: 2fc4a9d2d7e8662484a169edd11ee2f3d6e64e18a7b164fe9de6e182a0701be4