Malicious PDF — malware analysis report

Static analysis result for SHA-256 912a52f8ccb7a8c3…

MALICIOUS

PDF

81.6 KB Created: 2021-03-09 00:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3278cd0bce92064ba8b1b99f4563015b SHA-1: 20a31e33ff66cc765c275cefe65e9bde54ebc994 SHA-256: 912a52f8ccb7a8c3019d17216557ebe1b6e96d55aca5cb86a4ba38fa008d78b0
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 0.9998

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://resalured.ru/award?keyword=biconditional+statement+pdf PDF link annotation
    • http://vajogeboru.iblogger.org/filmora_9_old_version.pdfIn PDF document text
    • http://dularifok.22web.org/88882917594.pdfIn PDF document text
    • https://cdn.sqhk.co/sexubozadifa/Wt7if4O/quizlet_us_history_unit_1_study_guide.pdfIn PDF document text
    • http://astropsychology.website/manchester_city_2048x1152_wallpapercip27.pdfIn PDF document text
    • http://getcreditcheck.info/beauty_and_the_beast_story_book_disney65u0u.pdfIn PDF document text
    • http://xevazabavivan.22web.org/cessna_172m_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kuburarimoku/cLgfXhb/24228651938.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/eagle_cuda_168_power_cable.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/nida_audition_monologues.pdfIn PDF document text
    • http://activa-fb.com/draw_the_shear_force_and_bending_moment_diagrams_for_the_beam_and_loading_showntzwyc.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/febopa/toloxubapidalu.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/jeevan_amar_premium_chart.pdfIn PDF document text
    • http://balubusepebibi.rf.gd/tabla_periodica_con_valencias_y_nombres.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/media_player_classic_mega_codec_pack.pdfIn PDF document text
    • http://rawuwad.epizy.com/corporate_visiting_card_design_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/why_does_my_oven_fan_keep_running.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/lokozekotu.pdfIn PDF document text
    • http://pixafur.atwebpages.com/pdf_to_autocad_dwg_converter_online.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5256 bytes
SHA-256: b2e325f9e12f04ee2e93c156d6e5552ea6288ec2cf68840c4a6c3a83d02a7e2a
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 10548 bytes
SHA-256: bc06e51e5b29933b2a04938f0a867f130272011892cf3092c9aeffec8f0a73f8
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16888 bytes
SHA-256: 8609b4e6f90accba25424e84573677d39c1a77478010831f68d27e53ebbbd8f0