Malicious PDF — malware analysis report

Static analysis result for SHA-256 15baa934dd965b0e…

MALICIOUS

PDF

104.5 KB Created: 2021-04-06 13:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b44189e984376a38f81850f3066b086 SHA-1: 22b1979bb278a6e7ecf33e800a55f1cffd2a01c9 SHA-256: 15baa934dd965b0eb4d14a07857175fddb7d10b0cd1f5cc4dd2798d72e240633
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure to download further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=public+policy+analysis+lecture+notes+pdf In PDF document text
    • http://storeyou.store/fraud_examiners_manual_free_downloadvpz83.pdfIn PDF document text
    • https://daluwora.weebly.com/uploads/1/3/4/3/134319963/risamewegafum.pdfIn PDF document text
    • https://julixejim.weebly.com/uploads/1/3/5/3/135393951/nanezud-vapetunedidoja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_60672b5262845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_60417a994bd96.pdfIn PDF document text
    • http://svoytrylend.xyz/calligraphy_fonts_for_mac_freesythg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_600648315ed21.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/4954775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_60264329f13d7.pdfIn PDF document text
    • http://amst-watch-v2.club/babusotexusafaredupogyv3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_5fd5f7b558330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonivone.rf.gd/lijewamu.pdfIn PDF document text
    • http://fopebuzab.epizy.com/35272566376.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_caf49698deca4b34aebc17ef74295e26.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_103bfe461ca341328202b1917b793112.pdf?index=trueIn PDF document text
    • http://karuserewojax.epizy.com/22909557857.pdfIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_8193673e68314b529e4775375122c955.pdf?index=trueIn PDF document text
    • http://mawigugu.rf.gd/parallax_scrolling_html_website_templates_free.pdfIn PDF document text
    • http://gitinilu.epizy.com/arioso_string_quartet.pdfIn PDF document text
    • http://sojisij.epizy.com/98753206662.pdfIn PDF document text
    • http://pejefovad.epizy.com/bisection_method_matlab.pdfIn PDF document text
    • http://buletamapa.rf.gd/xekewarenin.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_off00015850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15850 5392 bytes
SHA-256: 82149c00caec1085ae207b21abe9e758edb095c5f4fc6955d2cb8febfe30d21e
font_01_sfnt_off00016ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB5 11560 bytes
SHA-256: 33b20a981b91ddda6c2c19bfda136967c624938babc4be5d6db0e920d57e3ecf

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