Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca71cfe1e9ce6e0…

MALICIOUS

PDF

81.5 KB Created: 2021-04-10 08:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0e5cba2474390ef8d8218cb708792c61 SHA-1: 614acd3e9c742a858e909ac003d1a331f14fa68c SHA-256: 6ca71cfe1e9ce6e05b352c9849a98b85d697ee8131391fc426aa011d94790d58
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=batallas+en+el+desierto+jose+emilio+pacheco+sinopsis PDF link annotation
    • https://cdn.sqhk.co/gujowaxexag/7jbhaic/mifuxazapukowivi.pdfIn PDF document text
    • https://cdn.sqhk.co/ridetalazo/fapiiKI/levizalaridiser.pdfIn PDF document text
    • http://mufadapi.22web.org/zoniwiw.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/jhbEhgq/pixel_kingdom_maplestory.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/best_short_stories_for_high_school_from_other_countries.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/Gicibhe/mountain_bike_accessories_for_sale.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/o_ceticismo_da_f.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/contaminacion_de_plasticos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • http://nadiripu.epizy.com/24347648372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4016b6eb-8a48-44fd-9092-c7aff407f094/50034768991.pdfIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_2e8b35d618054e9aa12eb4bc8b9b7630.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/293e41e0-432d-422a-b5af-b2c472030192/volkswagen_beetle_transmission_fluid_flush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3bd067-20d2-49e3-98ec-420b67afefb7/luruwexawotaz.pdfIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_f2c3814c0fc84aa292764ee5837de82a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8af8c69f-8536-4257-b5ef-5e7e03630586/how_to_become_acio_in_ib_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657e4013-7e89-4751-8cd3-f9fac1932375/twilight_saga_full_movie_download_in_hindi_filmywap.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_45330c8ba05147c8958d82e156578079.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 5228 bytes
SHA-256: 4307f0682668be0e2d3c6da690dd19d9c468055fba21976b762d3dd9230ad2ac
font_01_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 11568 bytes
SHA-256: c580e1ba635cd18ba6f501d37e9b29e94e2f1382bbb83cec4a66d24f3970000a
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2