Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a97b8c9e42cecda…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 454b65d373785fb0e3d1659eae8e83ce SHA-1: f514c2d0e91b2943dd4a6b09ce5ba3b0fda88691 SHA-256: 8a97b8c9e42cecda16f492fbecd99d1c4519dbab38582d53e902ca884108898c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=how+to+train+public+speaking+at+home PDF link annotation
    • http://characduwe.space/162518486740868k.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/883565860a734.pdfIn PDF document text
    • http://randname.ru/amc_10_2018_statisticssa643.pdfIn PDF document text
    • http://copyrightnotice-ig.com/jegaxokafegezbl99k.pdfIn PDF document text
    • http://espacecmb.xyz/vayan_y_furzalos_a_entrarn9j0t.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/nonamodo-dorijuf.pdfIn PDF document text
    • http://nokirixako.iblogger.org/88316565111.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/R4slevD/led_lights_color_changing.pdfIn PDF document text
    • http://tifebozazam.iblogger.org/basic_english_grammar_azar_workbook.pdfIn PDF document text
    • http://afracheat8.xyz/tuwupegfym6a.pdfIn PDF document text
    • http://look-hotel.com/10846632252ibdmr.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/OPhhDje/fruit_block_puzzle_legend_mod_apk.pdfIn PDF document text
    • http://samewejasaka.iblogger.org/alphabet_tracing_practice.pdfIn PDF document text
    • http://rezltml.xyz/vepazabitove9prn0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pemeromerap.rf.gd/industrial_aerodynamics_notes.pdfIn PDF document text
    • http://guradewididexep.epizy.com/tuduxobisokuka.pdfIn PDF document text
    • http://xixujoteb.epizy.com/basic_excel_test_for_interview.pdfIn PDF document text
    • http://lidezitenojugit.epizy.com/email_template_salesforce_object.pdfIn PDF document text
    • http://labapok.rf.gd/xexitirazuxuzo.pdfIn PDF document text
    • http://tezebidurob.epizy.com/kptcl_junior_assistant_question_paper.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_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 5604 bytes
SHA-256: d676a12ee795c63f2be712ed148ad9744be41aa2fbbdd3021c506c59c81beef1
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 11088 bytes
SHA-256: b00206928e337a8e9cabd7a8c89a1a5aa6963474ca96e3cd402d1ddc69240a86

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