Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4662de270ad957…

MALICIOUS

PDF

78.9 KB Created: 2021-04-25 17:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a29c872a0d7b6c6762270d74e6564af SHA-1: 8a6894093640d21afc7eeaa6700ad855426a025b SHA-256: bb4662de270ad9570873d48dc8c330fc8653793d225a7bd1411aacab7cbfc0e0
186 Risk Score

Malware Insights

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

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

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=where+do+i+buy+beats+headphones+2k20 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394066/normal_601fa195e93aa.pdfIn PDF document text
    • http://palejep.22web.org/b_m_w_car_image.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_600eca52f0000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevejalamozek.epizy.com/adrienne_maree_brown_emergent_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a13e9e-81df-4ab0-92a4-457af8452aae/primavera_p6_software_free_download_64_bit_with_crack.pdfIn PDF document text
    • http://pagupim.epizy.com/vibrating_metronome_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e95eec5-aae5-4d44-a0b2-d4395dadb205/how_to_dispose_of_sodastream_gas_bottles_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/age_of_adaline_subtitles.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_59a3987b095341659692b8db186bb1b5.pdf?index=trueIn PDF document text
    • http://zabotafe.epizy.com/kuzodebipamuvajava.pdfIn PDF document text
    • https://331e17ce-4321-42a7-89aa-067eaa3daeeb.filesusr.com/ugd/6576ad_fe265cc40b65458e9ffe76b3923911d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/tatodezuguz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff2fbeb-d8b0-40a1-a2a6-a6d3d316fd72/48531052431.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_3634818f4d6043cc90136aa2c0baf633.pdf?index=trueIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_6f32955465914d03b9da51c503196f65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f654fe89-bd91-4da2-92c0-f20b3df48e76/58800027662.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_aad2fe38461a470796e56551ad867b9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d278a32-00d5-4177-88ca-3cc5a663a8a9/the_things_they_carried_book_pages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c631f403-f9ef-4b88-9e9a-9fd689bfaffd/barnett_jackal_crossbow_scope_mount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4ac003-94a7-46a7-b5ba-05a48c7945d7/how_do_i_put_my_paper_in_mla_format.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_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 5608 bytes
SHA-256: 233fce32618fe842f6a1eca220336adc9d4408505119eda523128a2636ca1efb
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 11160 bytes
SHA-256: 3e427f1b876b00d431c1e2184655749bed6f2725b19b7e421e6e34da70225c11