Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e5ddcb94481cc9…

MALICIOUS

PDF

88.9 KB Created: 2021-04-11 07:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 10025a811289b1eb015dccbc36a7856f SHA-1: 34065b784e043508352b427dc8fa2835742dcbc3 SHA-256: 63e5ddcb94481cc9ad05b9da82ab1215a051541370ab00ace64be71ec92933d4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://jottigo.ru/strik?utm_term=as+a+man+thinketh+book+summary+pdf PDF link annotation
    • http://thelandofbadideas.com/siluxulo11mjx.pdfIn PDF document text
    • https://kigolaris.weebly.com/uploads/1/3/1/3/131380971/lozawubopazud_mafapigugig.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/7168944.pdfIn PDF document text
    • http://winoorama.space/lamukowefug1e7n8.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/finger_phonics_big_book.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/was_were_wasn_t_weren_t_exercises.pdfIn PDF document text
    • http://vienvozvrat.site/similar_polygons_worksheet_houghton_mifflin9qtb7.pdfIn PDF document text
    • http://virnet77.ru/basic_accounting_principles_in_bengalif7xzg.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/zotaluzejud_rejixafiji.pdfIn PDF document text
    • http://trudogoliya.online/73135376015k7edb.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/36858ca8-425e-4a03-bed6-5a602406ad42/a_series_of_unfortunate_events_game_free_download.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_ea0b9da2827f4196817e42565afa8edc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6362ebbd-e95f-416e-bc69-7e7a1b07a1a0/best_animation_software_for_free_download.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_e2ed4aeb065540d88bb56b375e567b5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff553737-3aca-4a96-893d-805fdff3697a/79903747958.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/how_long_is_the_hunger_games_catching_fire.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_04e427808711486284c2f18b262781d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/taurus_g2c_rear_sight_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f643d612-385b-4cb4-ac92-68323de3f3cb/vocal_warm_ups_for_high_school_choir.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_29b760dff94e485cb8b3fccabfc0f6ea.pdf?index=trueIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_bbf270c897b145fb9afa22bd0456a398.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/silver_eyes_fnaf_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/mixuramika.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_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 5544 bytes
SHA-256: 6d5d4b097a2815714ae2bce3bb270df610f97a7cf21e14da05ff2c72d53c9622
font_01_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 10804 bytes
SHA-256: ee14b6629ebcafae485646784c66ad885b265a25f0af6dc3188714362a8f567b