Malicious PDF — malware analysis report

Static analysis result for SHA-256 b562a80ad1140e84…

MALICIOUS

PDF

107.3 KB Created: 2021-04-11 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc4400b81ef3c9d08faa8183cf190083 SHA-1: 7495cc3f28bcf6da3f9a4a3780648299550a6611 SHA-256: b562a80ad1140e84c4c4e91a3e48b75617ff98030682d9bfdd438b0ccb6a08d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=how+do+i+mute+my+lg+microwave PDF link annotation
    • http://mumokajepuxu.iblogger.org/crystal_reports_for_visual_studio_2008_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_60633c6eb20e0.pdfIn PDF document text
    • http://cabinetshq.xyz/interview_questions_to_ask_employee_and_answers736mn.pdfIn PDF document text
    • http://kimidenexikox.getenjoyment.net/9209872384.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/how_to_crochet_newborn_baby_booties_for_beginners.pdfIn PDF document text
    • http://revershjtb.site/reset_blueant_s4lta5o.pdfIn PDF document text
    • http://bizifemodefi.mygamesonline.org/akkadian_english_dictionary.pdfIn PDF document text
    • http://fodibuj.scienceontheweb.net/aromaticos_quimica_organica.pdfIn PDF document text
    • http://vienvozvrat.site/john_gba_lite_pokemon_fire_red_cheats_rare_candy18edi.pdfIn PDF document text
    • http://kismyketio.com/slow_motion_video_app_android_freeljj83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_6052a20401ad5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_cdf782ddaa1340c69a3c16421be797d8.pdf?index=trueIn PDF document text
    • http://kilarosine.atwebpages.com/criminal_law_definition.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_37a312206e7f4632a73c70d7e92698dd.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/prevencion_del_alcoholismo_en_adolescentes.pdfIn PDF document text
    • http://motinekan.epizy.com/earth_s_layers_worksheet_middle_school.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_0b02c287b8dd4d3ba008427614e15e3d.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/rozigalexekuzibojapa.pdfIn PDF document text
    • http://zafagolakogud.rf.gd/veneer_door_design_catalogue.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/concepto_de_artes_visuales_y_su_clasificacion.pdfIn PDF document text
    • https://c1ab63b4-4781-4901-abeb-f581ed41d26f.filesusr.com/ugd/b44917_cb4a5dd342e142e491ff2ed8bd36f2b5.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_65b704195d9b4cd3be50d64819e6fb28.pdf?index=trueIn 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_off000150f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F6 5072 bytes
SHA-256: 53774cd804be37cb13d16bbac6940faa63fa3d2f3d3ef1f6f73029c3e160b501
font_01_sfnt_off00016255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16255 14516 bytes
SHA-256: 6b871b7e674c65ec1b6d63894538362fe459faea8a8780cd7bf409d85373aa85
font_02_sfnt_off00018f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F90 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176