Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47cd37911293d7e…

MALICIOUS

PDF

77.6 KB Created: 2021-04-21 00:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4044a58b579e020d51f2b066f568a37d SHA-1: 70e40b3ef6b908776698843dccc1c134979c53ca SHA-256: b47cd37911293d7e179e758572bf1de3a7b6fe9f6bdfb4dc1a0f2a1a21b723e9
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that redirect to various PDF files hosted on disposable domains. The primary purpose appears to be luring users into downloading potentially harmful content by disguising malicious links as legitimate document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://botokaw.ru/strik?utm_term=control+system+engineering+book+by+nagrath+%2526+gopal+pdf+download PDF link annotation
    • http://pro-komp-master.website/355257000976mhc3.pdfIn PDF document text
    • http://digitaloffice24.ru/centrifugal_fan_curvedo3yl.pdfIn PDF document text
    • http://daravto18.ru/2114297388135wwb.pdfIn PDF document text
    • http://abreudesigns.com/appcelerator_titanium_studio_for_mac4fm6t.pdfIn PDF document text
    • https://palegovod.weebly.com/uploads/1/3/1/0/131070329/9837651.pdfIn PDF document text
    • http://redirunna.xyz/i_ready_quiz_answers_level_c_readingriq6o.pdfIn PDF document text
    • http://skidki-day.shop/pevuvaxunelurozajemumewrbpkj.pdfIn PDF document text
    • http://medicalpracticementor.com/antares_autotune_8_freesumpm.pdfIn PDF document text
    • http://meinekarten.best/sennheiser_ew_100_g4-me2-ii93zzv.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/inductive_and_deductive_reasoning_worksheet.pdfIn PDF document text
    • http://sayfelengs.space/58670747172nmsys.pdfIn PDF document text
    • http://samozanyat.info/nike_clothing_size_guide_uk82xrl.pdfIn PDF document text
    • http://talkme-news.info/taraxosefipovumipasogoxevehjyb.pdfIn PDF document text
    • https://petivevidimow.weebly.com/uploads/1/3/0/8/130813859/3346630.pdfIn PDF document text
    • https://wobajaxeme.weebly.com/uploads/1/3/4/3/134350369/7280270.pdfIn PDF document text
    • http://usacreditcheck.info/dance_academy_full_movie_freeqaioc.pdfIn PDF document text
    • http://masajsalonunuz.com/133779939335msd3.pdfIn PDF document text
    • https://fomodefoz.weebly.com/uploads/1/3/5/9/135958111/mafiduwupolu-mozalefi-jepevulep.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/7481424.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/zaxip.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/ritetemp_6022_reset.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/47645261621.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/jasper_report_format_date_parameter.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/bagadiya_ke_dere_mein_ragni.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/octonauts_coloring_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/anandi_gopal_marathi_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/individuals_file_form_b_b1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E0 5308 bytes
SHA-256: 85db7913cd05f5b67358052681e801883089a79960cf94c72e531941c831f97b
font_01_sfnt_off0000f9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C0 2116 bytes
SHA-256: 316f78c6e162999e43ccb83d429ef85c46045bf1ac59c77d169faf589ecd4eba
font_02_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 10676 bytes
SHA-256: 47326d3fcebf22f296759541de8cdb91cc78c192ccfb68137b5ebd883a1a76f6