Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03a4a00a9d37496…

MALICIOUS

PDF

84.5 KB Created: 2021-04-03 23:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: df2dfd892e4e62c219187142e67020c4 SHA-1: cb961c514d5a131b45e102d6bee50441ddb9a4c5 SHA-256: b03a4a00a9d374967c3380c0a976c96f767929d55f518d8a3fc72be7ac3b3bdf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://midufefew.ru/strik?utm_term=garmin+gpsmap+62st PDF link annotation
    • http://mapotilij.mygamesonline.org/dulalepakosigomodafekikar.pdfIn PDF document text
    • http://servisvds.ru/dojirevuwixatozai9v.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/srimad_bhagavatam_in_tamil_free_download.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/fowafiti.pdfIn PDF document text
    • http://bigtittybella.com/bekataduwakegebrau5c.pdfIn PDF document text
    • http://storeplus.pro/arabic_alphabet_in_different_formsf1uc4.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/algebra_1_linear_equations_test.pdfIn PDF document text
    • http://idclick.cash/cuantos_cm_es_un_metro_en_escala_1_50gby5d.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarasam/tgj0jj0/transfer_station_dump.pdfIn PDF document text
    • http://sberpodarok2020.online/backpage_edison_new_jersey22zec.pdfIn PDF document text
    • http://visionnew.xyz/briggs_and_stratton_5000_watt_generator_manualoc83w.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/4NNhehe/centris_fcu_locations_omaha_ne.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/gdbmYwH/xegabov.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/wagiborokotibofatax.pdfIn PDF document text
    • http://miwuzobi.sportsontheweb.net/barbell_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hbSmjgB/splendor_in_the_grass_cast.pdfIn PDF document text
    • http://segway-wheelchair.ru/english_story_for_reading0x5xo.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/sales_and_marketing_director_job_description.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://widepidaba.atwebpages.com/ncert_biology_class_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4aa6d3a-4d8a-421c-8b0a-cca74c114b65/does_dunkin_donuts_have_gift_cards.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be23045-aecc-443b-bcea-189dfca4ccc8/why_my_ge_microwave_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd53c202-ca6e-440e-885a-fb7a8139b21f/97263111135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/128413ee-9f36-4e05-81b5-ffc3dfcfa148/pigogeninelewizisetejasa.pdfIn PDF document text
    • http://kikanelomer.onlinewebshop.net/what_does_522_mean_in_angel_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbd8f6b-8092-401a-a34f-1d3bf94c6588/2007_f350_6.0_powerstroke_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 4984 bytes
SHA-256: 443b2b4b8c7a7ddea32a36f6e35c5b133a7b384423db037f3fd94117fa07efd9
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 12716 bytes
SHA-256: 31822c20d2887c840f752ab0d9f81ea8475751842076cd7351cdc5211775baf6
font_02_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230