Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b7bdf5c3b55b2b…

MALICIOUS

PDF

70.8 KB Created: 2021-03-15 18:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d8041b28244799ef25837842a17cde7 SHA-1: 70ba44d3ab850c7449637e78f06e1071a2064528 SHA-256: d4b7bdf5c3b55b2b149bb4d3e4e359ef30f50c2c86f215992d5b248e7a0ba611
134 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/123?utm_term=barron%2527+s+ap+calculus+answers PDF link annotation
    • http://sowopezamiw.medianewsonline.com/certificato_anamnestico_per_patente_di_guida.pdfIn PDF document text
    • https://pufopobumosuv.weebly.com/uploads/1/3/0/7/130776602/benekiwup_suzikinukuwu_javog.pdfIn PDF document text
    • https://falugasotemo.weebly.com/uploads/1/3/1/4/131410545/7f4a4ecee7.pdfIn PDF document text
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/kutawenuduw-waxugowivabuju-minajemukeru-bumodapu.pdfIn PDF document text
    • http://movilatur.iblogger.org/the_mentalist_season_5_episode_5.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/zenero.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/xigheig/wokibudun.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/20cQzbO/rally_racer_dirt_apk_day.pdfIn PDF document text
    • https://wivutabunoku.weebly.com/uploads/1/3/6/0/136020101/6ccaf7aa9b59.pdfIn PDF document text
    • http://beduzevitugok.mypressonline.com/74517157990.pdfIn PDF document text
    • https://cdn.sqhk.co/gogamosujimi/V1jaOlQ/razawodilalujowiboluk.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/qEQUpig/homemade_facial_mask_for_acne_and_dry_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/U6gihja/transformers_earth_wars_mod_apk_latest_version.pdfIn PDF document text
    • http://ralugugifoxatir.scienceontheweb.net/12949358789.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/vifapopuz.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/zubata/4_types_of_sentences_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/how_to_setup_a_cradlepoint_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd1c367-5c22-41b7-9f5d-ddb524a574a2/what_happened_at_the_end_of_the_veldt.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/85961277157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b942c0d0-81a1-4600-a3c0-2db41606f8e8/best_stories_to_read_to_7_year_olds.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/tarurugidonulin.pdfIn PDF document text
    • http://metorudadoz.rf.gd/68020069140.pdfIn PDF document text
    • http://fozipifi.epizy.com/omron_bp710n_vs_bp7100.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/west_bend_hi-rise_bread_maker_41300.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/oscilloscope_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e759a190-8149-4a63-b15e-416649d67b24/once_a_runner_chapter_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018fb13b-eb39-4268-a3ae-8c8ad25481b5/gexasadakepitagudij.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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 5104 bytes
SHA-256: 3d651825870b36ff0abf04c186f318fec24c5db5adaebbc271f9c804b227bd12
font_01_sfnt_off0000e8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BE 11088 bytes
SHA-256: 5818fdb3e299a63de712e119a8b670dbc0fddf0b25f4e3d8c5e8cb9d659ca29f