Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc5a599100f5c69…

MALICIOUS

PDF

76.6 KB Created: 2021-02-24 14:35:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ae3b221de18979994d247f2968445cad SHA-1: 772ab7dd0be3c7907f921ae52e2047719048f822 SHA-256: 0cc5a599100f5c69997916a603bf5fabc1b4ebd7f7fc8786aa7f6c4f4d54efa8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to setting a watch time, which is likely a lure to encourage users to click the malicious link. The ML classifier and ClamAV detection further 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://crophysi.ru/strik?utm_term=how+to+set+time+on+armitron+wr330+watch In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372399/normal_5fd93e0e3c081.pdfIn PDF document text
    • http://kigurumi.org/omega_psi_phi_history_bookulm0t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_603585fd50ba5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466657/normal_60072b7feaa08.pdfIn PDF document text
    • http://mmeueue.space/zezajaraladuvedobugo1o1w4.pdfIn PDF document text
    • http://mon-cmb.best/wakiwazobuwuzm1hbb.pdfIn PDF document text
    • http://generatorsale.ru/dukilan9pks.pdfIn PDF document text
    • http://circleshtang.xyz/dimensional_analysis_practice_worksheet_with_answersqe1qp.pdfIn PDF document text
    • http://questotzvezd.space/romaxakepu4z4d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_6017602c5a7fa.pdfIn PDF document text
    • http://gromstroy.com/74371549891akje1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fe7f6bc5ee5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xajuvezovaguze.rf.gd/didag.pdfIn PDF document text
    • http://bidilud.rf.gd/tajid.pdfIn PDF document text
    • http://zoletiwosi.rf.gd/baazaar_full_movie_480p_filmyzilla.pdfIn PDF document text
    • http://vanudedu.epizy.com/wanted_poster_template_in_french.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_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 5364 bytes
SHA-256: c661a2c98cb768e3039382dfe2050547e97b260419dd048b51b9320c48d50fa4
font_01_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 10756 bytes
SHA-256: 5c17900732795a9fa427aabe107222bad3f94b2b7f9a6144539c9360dfbeaa9b

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