Malicious PDF — malware analysis report

Static analysis result for SHA-256 73edc2c9431b3490…

MALICIOUS

PDF

79.5 KB Created: 2021-04-16 22:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 88d0e85d38137e437553d806a131cb82 SHA-1: 14a2fa8c19adafc62e5cde6e1d588d1f2e8dd3ff SHA-256: 73edc2c9431b349078a6f66d37d3fef503274b3e955800ab21cc70b5ea82bb34
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/strik?utm_term=times+table+sheets+printable PDF link annotation
    • https://cdn.sqhk.co/tukawezezo/ifhcjfd/kixeye_war_commander_units.pdfIn PDF document text
    • https://cdn.sqhk.co/magimoruki/giehigc/75948488774.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/dgdhEgh/pocket_rogues_ultimate_best_class.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/ii2ijgg/heroes_of_camelot_card_shards.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/Cy5rggZ/34901555788.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/ijhFZOu/40494616946.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/evmieg6/cnc_wood_shop_near_me.pdfIn PDF document text
    • http://babobekoru.66ghz.com/naming_acids_chem_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/2jeDGib/airplane_cast_sick_girl_mom.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/marvel_movies_in_order_of_mcu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5da1c7d8-01c4-4175-bbf8-c25915566394.filesusr.com/ugd/1084fb_8966b8b705154212adf2838164bca27f.pdf?index=trueIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_069ef33c1caf4fe9b60c56c0ace99fb1.pdf?index=trueIn PDF document text
    • http://dilalixurapa.epizy.com/cengage_learning_lab_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cdafc5-0f12-4dfd-b90a-66f558bd8965/texivegovejujovebuwupib.pdfIn PDF document text
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_2a2300b34607438d882ff0ff47d16450.pdf?index=trueIn PDF document text
    • http://gurimatos.epizy.com/mojave_road_guide_by_dennis_casebier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9512c1f-1d83-45dd-a754-72a996525786/webamukibamenuxitig.pdfIn PDF document text
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_a2917bf1e12647c0be72ab5190671ccc.pdf?index=trueIn PDF document text
    • http://sabuxixu.epizy.com/64876784029.pdfIn PDF document text
    • http://fokavugepiromi.epizy.com/15494046914.pdfIn PDF document text
    • http://bolesumedinix.rf.gd/jakatesinideluzinef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e314dd5-585c-4ef0-8ee2-d7b249b8245c/maze_runner_2_free_full_movie_online.pdfIn PDF document text
    • http://zepuzirubigu.rf.gd/tamil_nadu_ncert_ancient_history_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07ca1b7-6ee9-4f7e-a161-cc6d9edd8d9a/pejogop.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_1a7a146b2f6345278f0669c66ce2b38c.pdf?index=trueIn PDF document text
    • http://xiwaresijo.epizy.com/nccn_lung_cancer_screening_guidelines.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_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 5148 bytes
SHA-256: 3a02efdd1e4bc770ce9ebe9e97c4f9143b8a4605e647462aceb3caeeb40aafb3
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 10424 bytes
SHA-256: 4dd6d3c731294c46fab091c77750b500c5665682f82ce7672de60e23af0dc737