Malicious PDF — malware analysis report

Static analysis result for SHA-256 5178c0625c7549ae…

MALICIOUS

PDF

81.2 KB Created: 2021-03-19 23:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a2eaf12e3ba83c06ef5890ab6dae1f2f SHA-1: 3e7614e9a27d6df80025688b411623eaba68a7c1 SHA-256: 5178c0625c7549aea83477ff0c8bda8e36d6b7228023329c5374da71b5707848
186 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 pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://golowaki.ru/123?utm_term=tratamientos+para+la+anemia+de+c%25C3%25A9lulas+falciformes PDF link annotation
    • http://mopexaxurip.getenjoyment.net/rodrick_rules_book_plot.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/bhilsa_topes.pdfIn PDF document text
    • http://the-job.ru/how_to_write_a_speech_about_yourself_examplestv09e.pdfIn PDF document text
    • http://cyberlife.store/synopsis_thinking_fast_and_slowefdwv.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/nota_keuangan_rapbn_2020.pdfIn PDF document text
    • http://christmas-gift.ru/graco_mysize_65_car_seat_manual6p15a.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/74899669877.pdfIn PDF document text
    • http://romeoplanet.club/mercury_4.3_intake_manifoldq853m.pdfIn PDF document text
    • http://clyb-wylcan3.space/beat_street_customeajtr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_2642da174e8544628bb2fe7d13bcea02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc6204d4-a2e4-4314-8358-167a4257a51a/11480355540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2aa98e-50b3-411c-94ea-5a1d517e3744/how_to_find_the_right_tone_for_a_song.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_ac4169cc1a5a454f9615cc57de91015d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c59d7c-b10b-4fde-818f-17915b569a71/vijagol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb57b06-b5a2-416a-a5db-27afa59b8ca1/2017_vw_passat_transmission_fluid_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cf1877-6864-4ce5-8ddb-e12c617a3eba/25488994186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50be7de2-ca55-4b52-a972-ef7ae9535862/what_is_esl_placement_test.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_ea8680eacd3949cdb680e8decb228146.pdf?index=trueIn PDF document text
    • http://miwewugewu.atwebpages.com/19190153038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ace12cc-c7fa-4ed6-a470-3f0eed16472a/etymological_dictionary_of_proto-germanic.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_5bb92274a9e84f6790716c2d1f6bc3db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b2ec7a8-2231-462c-9e24-580f72eed0a3/dusijetapafos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c32ecf9-4c46-498c-a97e-56d01820d13b/how_to_join_in_google_meet_app.pdfIn PDF document text
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_dd6cf8008b8d4d51aced403b0ea9aae7.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_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 5392 bytes
SHA-256: e20a9e1c897145a42115195c900ce0135e701308b472e6a75a1b9c8c91c19442
font_01_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 11528 bytes
SHA-256: 7daabf5eeecf4a262d8f1100140a819baed63bd59d1ee19dc78de88cd620b1fb