Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd5c73c3894c994…

MALICIOUS

PDF

95.3 KB Created: 2021-03-13 18:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bf475fb9608029b08f1ff20da45614b9 SHA-1: 5b1ff8745a74c7365fc9ec0dc521d37ce07e9012 SHA-256: 1bd5c73c3894c9940e92d09f505ae0e179f3bae9e03fd4caa69703d013ce46b9
146 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. It uses a callback-phone (TOAD) lure. 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 0.9991

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/award?keyword=tata+sky+plans+and+packages+pdf+download PDF link annotation
    • http://xawamiwupajev.mygamesonline.org/apprendre_le_russe_dbutant.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/42009228768.pdfIn PDF document text
    • http://bratskpravojur.ru/which_excerpt_is_a_counterclaim_in_what_to_the_slave_is_the_fourth_of_july_quizlet1271t.pdfIn PDF document text
    • http://accface.in/2300707523453lui.pdfIn PDF document text
    • http://peuer.xyz/remote_control_urc-8820-ciscoayn95.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/hp52Pmw/world_war_series_movies.pdfIn PDF document text
    • https://cdn.sqhk.co/jufenakajo/gTgj3gg/video_game_design_foundations_software_design_guide.pdfIn PDF document text
    • http://reduslim-shop.site/homeland_gustav_holst_sheet_musickham1.pdfIn PDF document text
    • http://erogan-oficial.site/lg_fridge_service_centre_in_coimbatoreomkda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xijotat.rf.gd/71058953410.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_0d68ff9251394fafbdc07245a620da37.pdf?index=trueIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_22273d200d134154916e78bf832a984a.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_a04e04322ea24afc8ea5a0b214f78a26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f804747-5100-4182-b342-0d292450c805/11561407231.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/rival_deep_fryer_filters.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_4599b19053e1424d8521f6cbe2a8faec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c15cf93-3f55-4604-9303-c57d5a6deb8b/71920604366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd9273f-cd80-49e3-8c33-55bf97ee3676/troy_bilt_tb425cs_trimmer_head.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4de0ee-b965-419f-84d7-8fb915dce4b2/which_country_have_the_highest_gdp_in_africa.pdfIn PDF document text
    • http://risuduk.epizy.com/how_did_the_constitution_affect_america.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/gogezokuvuwulezopi.pdfIn PDF document text
    • http://kidoputuf.epizy.com/vojafetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41632130-265b-426f-813a-aea7f9ea7641/36732535168.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/gisegifivol.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_db484e0e04894a66bf445640aae17f3f.pdf?index=trueIn 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_off00013638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 5432 bytes
SHA-256: 808cbf7c8a46083cb26b086bb90c4ab3fdcfd754e54d8c7b83e38efc45236db4
font_01_sfnt_off000148ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148ED 10684 bytes
SHA-256: e863b063dd29d73c563bfdf714c7bea00237a0cadc38ae0cad2827c2cd3bde9a