Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c6e87e7621d791…

MALICIOUS

PDF

87.1 KB Created: 2021-04-01 15:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3ca7d2998e44f48aeefe7cb38ea18bef SHA-1: 276496164632147e7ceed8aa074adc785b66c18d SHA-256: 40c6e87e7621d791fb8ae0e08f4a44fd15c275d66f1f782538d1fec54328f12e
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kuzutuzo.ru/strik?utm_term=storm+front+audiobook PDF link annotation
    • https://cdn.sqhk.co/vanewano/aiiGjih/zikerotufukokaxofipu.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/ig34gfD/paypal_app_for_android_tablet.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/uhcjbge/tron_light_cycle_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/heicghx/what_video_editing_app_do_tiktokers_use.pdfIn PDF document text
    • http://tenefadapom.iblogger.org/23350401602.pdfIn PDF document text
    • http://idealica-columbia.site/north_indian_non_veg_food_menu_listvg12r.pdfIn PDF document text
    • http://info-pages.ru/83643603646yzm1y.pdfIn PDF document text
    • http://baykamif.space/49884624085prlv4.pdfIn PDF document text
    • http://rovepofaji.22web.org/85022654640.pdfIn PDF document text
    • http://xixubinetigos.iblogger.org/xeriwokilemajabaruzuweduw.pdfIn PDF document text
    • http://techanomic.com/does_toro_make_a_good_zero_turn_mowerdmboa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/ayat_kursi_full_version.pdfIn PDF document text
    • http://gikipixuvi.rf.gd/the_law_officer_s_pocket_manual_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15432ca-72e6-4a5b-99b9-df70e4136ca0/what_does_it_mean_if_the_wps_button_is_red.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/nogubeverajimuzukokibawi.pdfIn PDF document text
    • http://pejatopofir.rf.gd/27276905186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af5c0cd3-1d47-4471-84eb-60af941cd5cf/lajuririkuzokudiwajuba.pdfIn PDF document text
    • http://giluzufuropej.epizy.com/arduino_uno_starter_kit_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/74414145572.pdfIn PDF document text
    • http://xubedoper.epizy.com/aliya_janell_when_we_video.pdfIn PDF document text
    • http://sovewegupafipiw.rf.gd/antimicrobial_activity_of_plant_extracts.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/55492439954.pdfIn PDF document text
    • http://nukuwura.rf.gd/73807118303.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 5148 bytes
SHA-256: 580909d4248a4d36d8bb7926b86550e77cc12b480241f972d6cf76b361ff1343
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 11580 bytes
SHA-256: 77a87ed32c0c4d638275f8f5e2c19a62282541473f4e3e13f8ec06641edf96b8
font_02_sfnt_off000139fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6

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