Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ba1cb867f5fb42…

MALICIOUS

PDF

92.8 KB Created: 2021-03-20 08:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 55aa3b441fc519533587836434b25e0a SHA-1: 9dc44b58088a831da01fd313b58e072c9e41c6ea SHA-256: 20ba1cb867f5fb42b37e56542b1d6aa9c9a93e91762fa31f461e35d2ba1db1b3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=minn+kota+terrova+80lb+thrust PDF link annotation
    • http://nipijapogila.sportsontheweb.net/41211456288.pdfIn PDF document text
    • http://in-step.shop/how_to_write_a_staff_memor3lcl.pdfIn PDF document text
    • http://chempion.coffee/physics_for_scientists_and_engineers_with_modern_physics_4th_edition_giancoliiwiax.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/bjfnG1c/the_advisors_alliance_2_eng_sub.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/2bThe06/52808518740.pdfIn PDF document text
    • http://penageli.getenjoyment.net/96454713099.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/roku_soundbar_black_friday_2020.pdfIn PDF document text
    • http://tradestaroffice.com/iatkos_ec_download3nyis.pdfIn PDF document text
    • http://checkmyscore.info/wendys_menu_prices_2021ql95i.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/cuisinart_bread_maker_replacement_parts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_8c9940d003054c5cb4d34580ca2b1f4b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb6e385-e2a2-47b8-a7b6-97608030d5a1/are_washington_dc_museums_open_on_easter_sunday.pdfIn PDF document text
    • https://b5c90759-dbf8-4ccd-b12d-e23c958527f9.filesusr.com/ugd/915a55_0937022d67944be8b1de143bb6cb689b.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_146d6ef02e5c45649e971eea55a8a3a6.pdf?index=trueIn PDF document text
    • http://roveramo.atwebpages.com/teludo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29634032-72dd-441c-ba96-5fd2aae5c865/85418661416.pdfIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_02c5fa0fc730473ca2a06dcbf3bd0aeb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c78fde-47fc-429a-9122-6216f8b6e7d9/ejemplos_de_comunicacion_informal_en_una_empresa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae8086b-3222-44f8-b63e-c5650c831595/definicion_de_quimica_organica_segun_autores.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_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 5380 bytes
SHA-256: dc29a7103430476f34a40a50536f5967f397b41daa5f98c843e9417033cc6ab3
font_01_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 12728 bytes
SHA-256: bf2673447bfcd65a0bc03205d9a16a66daf7cf31024f7379f1cf85c49b8e9dda

Open this report in the interactive analyzer, or submit your own file for analysis.