Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a58babc520dc14…

MALICIOUS

PDF

73.0 KB Created: 2021-03-09 13:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0001544ae85f76fb61aac37b5c0b33ee SHA-1: d1e1c28be346ddc372e7bad03987d26f0e6e1c83 SHA-256: 63a58babc520dc1412ca11a2b15b2d6a3949db8265861cc6eb8f7c19ea021eb9
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm designed to distribute malware or conduct phishing. The ML classifier strongly indicated maliciousness. Although no scripts were explicitly extracted, the PDF structure and numerous suspicious URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=graph+paper+template+11x17 PDF link annotation
    • http://glawerry.online/wesupufx2v1d.pdfIn PDF document text
    • http://zespodsvetkoy.site/who_will_play_diana_in_the_crown_season_4p1aq5.pdfIn PDF document text
    • https://cdn.sqhk.co/fojupigek/MspjiB8/grendel_farming_guide.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/9570145.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/matiwudosiwode.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/BhauTih/willy_wonka_slots_free_casino.pdfIn PDF document text
    • https://gamunodeda.weebly.com/uploads/1/3/4/7/134765824/suwuvagolezu-zimusudewara-kidajob.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/Tjcdijd/creative_destruction_hacker_vs_ninja.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/mejusovo.pdfIn PDF document text
    • https://rifusefabizavi.weebly.com/uploads/1/3/2/3/132303317/gewizatejuzo.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/zufosomexixadmbcux.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/fhbAXha/camp_red_ball_vietnam.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/hfihfTb/30620857668.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/nelejedudobogubawijabewe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b343b8e-3d85-4392-a2bc-16e8ad0396cc/41450626987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9544232a-81bf-42bf-b31d-f536a9b25ab3/how_old_is_ahsoka_in_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112f46b8-e1d2-453c-8f9f-23e405983282/timex_weekender_chronograph_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fce6117-f7bc-4f09-bbc2-a1cadfcda8dd/can_all_clad_slow_cooker_go_in_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4373452b-cb06-4bd3-869f-0e5d404f79a7/how_much_did_hancock_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9bc3fa-46a6-4430-a943-cb52cfb67ef9/95414600601.pdfIn PDF document text
    • http://wenares.myartsonline.com/what_is_the_latest_software_update_for_samsung_s7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccab86da-29f1-4f2e-bd03-dd5efdd999f9/powejixuzojag.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5112 bytes
SHA-256: 484be3808b5c4c23a3a502bd5bca215067d9995321c2a868872a86d94e2dfd24
font_01_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 9780 bytes
SHA-256: b403f5b74789c7edcd8078e3ffe5647084b4b9f87a59da2b704654b0db688d54