Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e8ac0b4fac421a…

MALICIOUS

PDF

75.9 KB Created: 2021-02-25 18:20:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a96746869c950f35e9c9439121610c86 SHA-1: 64810e3e35767e29403b0ebe21506327725cd1c3 SHA-256: a8e8ac0b4fac421a9a25ad87c7cd0921d7b01c5b0a252f6b73423ea060435586
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious 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
  • 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://baarspo.ru/award?keyword=what+are+the+three+laws+of+power PDF link annotation
    • http://vovality.club/859026104936fuot.pdfIn PDF document text
    • http://milanomoda.site/the_leadership_experience_richard_daft00ul1.pdfIn PDF document text
    • http://vipmanmarket.space/dodotilyxzgc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481852/normal_600a00a8246fe.pdfIn PDF document text
    • http://studytogether.fun/net_framework_interview_questions_for_2_years_experienceb60nw.pdfIn PDF document text
    • http://mybiol.site/6540212243iu3z1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5fcdc6094976b.pdfIn PDF document text
    • http://sdek-24.cc/classic_cars_for_sale_dothan_alabama_craigslistuunvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_601616a6e67a6.pdfIn PDF document text
    • http://ita-women.space/fuxegiti3ks3v.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/lord_of_the_flies_book_and_movie_comparison.pdfIn PDF document text
    • http://safetymirrors.xyz/bubble_fruit_one_piecestpdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486563/normal_60041453c9acf.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/61950577130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukinajomo.epizy.com/contractor_bid_template_free.pdfIn PDF document text
    • http://wexereza.rf.gd/nutritional_information_for_1_2_cup_blackberries.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/how_to_develop_android_app_for_beginners.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/karcher_3.99_pressure_washer_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/43984380938.pdfIn PDF document text
    • http://dovobol.epizy.com/jekoxemenusuwekawirafujab.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/60327087283.pdfIn PDF document text
    • http://residarifuwus.rf.gd/87270047090.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_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 5096 bytes
SHA-256: ee8f6eccc939e27effe10f9a07f2e7a99640258b5221dea395866378f83058ff
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10596 bytes
SHA-256: 38983abadd271c57ae5e5f11c199ddd1c14c3fe1a0d635438ff4e05d3940e8a2

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