Malicious PDF — malware analysis report

Static analysis result for SHA-256 8853607436db2ffd…

MALICIOUS

PDF

76.2 KB Created: 2021-02-25 20:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8ce02f73fd30dfcd416a58b1c0b50a1c SHA-1: e1d1c9056670b4d81c563be2edf495c59824202e SHA-256: 8853607436db2ffd9dd2501339261aa8f8d5ceeac973f458f52066966d565d7a
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to be a lure related to a product search, likely to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=where%2527s+waldo+shirt+amazon In PDF document text
    • https://static.s123-cdn-static.com/uploads/4455198/normal_5ff650e3945e4.pdfIn PDF document text
    • http://vehicleinsusa.com/rametaduxajiwc55rh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463794/normal_601da47e3cb90.pdfIn PDF document text
    • http://onlajn-kassa.ru/commonlit_answer_keyifu32.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/gavokimekosip_puganug.pdfIn PDF document text
    • https://gejilesiwurulu.weebly.com/uploads/1/3/4/3/134374779/razuwegajaxa.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/1115bc335.pdfIn PDF document text
    • http://baugroup.info/wubategigakaras2jct.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/bleach_brave_souls_rerollh5le9.pdfIn PDF document text
    • http://supsun-aero.com/for_game_loop7wkzt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482407/normal_60090d63cff88.pdfIn PDF document text
    • http://nubolutlion.xyz/semixabodokonijaxavivafqr7y9.pdfIn PDF document text
    • http://formblckr1.xyz/html_and_javascript_exampleezgjp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384039/normal_5fd2510cd38b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369930/normal_601b162953b64.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/287d0c71bf39b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502511/normal_6002fee975b1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA80 5256 bytes
SHA-256: e482da294e931d245a24ab24dc005b94be711e494edf1a60a6a00175605b7381
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 11068 bytes
SHA-256: a665ee5e1149c4c47b7f3f8cf2009a4f7cc1a08109d1a3d52d0ae405613bf121

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