Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d63e3a4f3e7a1c…

MALICIOUS

PDF

89.7 KB Created: 2021-04-02 05:39:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7eb9b420b986af9a4a4a72ad72eb5f68 SHA-1: 6a1f11b6d38ad8052fcfada3db98a43c61b89f5f SHA-256: 45d63e3a4f3e7a1cddfe40ca499f3a38caad8ec93d3e571f8818d9f13905f49d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of a link farm on disposable hosting and the ML detection strongly indicate malicious intent, likely to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/aws?utm_term=free+phonics+worksheets+grade+1+pdf PDF link annotation
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/7204dc475fccc.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/ZdHiage/enemy_strike_3_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/fUcvgg7/fisiopatologia_de_la_cirrosis_hepatica_alcoholica.pdfIn PDF document text
    • http://debagigitefofo.iblogger.org/odyssey_pioneer_ddj_sx2_case.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/difiBqV/game_hit_zone_dead_city_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nezerozara/3tGiUp2/towebokujezoturidudewejur.pdfIn PDF document text
    • https://dudosixe.weebly.com/uploads/1/3/4/3/134323580/4ab9e0d2bc5c76.pdfIn PDF document text
    • https://tetomorefaboma.weebly.com/uploads/1/3/1/3/131384600/5572384.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/ihgi5KJ/minudorarudosatog.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/QAezhdu/rojekesasenaromis.pdfIn PDF document text
    • http://xaduwojitodefo.66ghz.com/embodied_cognition_theory.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/hexBMji/dailysale_discount_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kagalitisup/5hf0gik/33276374245.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/gjjMIUk/crash_racers_vehicles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/the_purpose_of_writing_a_personal_narrative_is.pdfIn PDF document text
    • http://livirava.atwebpages.com/list_of_us_airport_codes.pdfIn PDF document text
    • http://suzufesa.epizy.com/57860790841.pdfIn PDF document text
    • http://vikajedixased.rf.gd/phd_research_proposal_sample_political_science.pdfIn PDF document text
    • http://xidaruk.rf.gd/karl_marx_bourgeoisie_and_proletariat.pdfIn PDF document text
    • http://jawozamamopenis.rf.gd/how_to_backup_android_phone_before_rooting.pdfIn PDF document text
    • http://zujebagita.epizy.com/sig_p226_hogue_extreme_grips.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/contractor_invitation_to_bid_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 5548 bytes
SHA-256: 671aae53962a737849c6a9ad3aa9c1d13305284b59774082de5bc43b088842dd
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 11892 bytes
SHA-256: 0b1412104254d0fbf64a3b32f3910d31beae00fcb27204a87480d0499d6d8d7d
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 16384 bytes
SHA-256: 1b4378a20dc0c6838424c5aa451222226607381843c322e2c08cc180f14298f4