Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e3e629d1a366a6…

MALICIOUS

PDF

82.0 KB Created: 2021-04-01 16:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d092f306b9e7467cb39149bb22a06b63 SHA-1: 531d34d2d35564bea66aec46328da946f60c89a2 SHA-256: c3e3e629d1a366a6a16e7d502502de64dfada773d1a7a451c0f784735fc23844
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 0.9991

Heuristics 6

  • 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 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://mezovuduw.ru/wix?keyword=preguntas+b%25C3%25ADblicas+adventistas+en+power+point PDF link annotation
    • http://wowovamofuzo.sportsontheweb.net/99048179563.pdfIn PDF document text
    • http://pelinebaj.mypressonline.com/sepata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f13957c-906b-49ba-8d92-18075d99f8f0/jexiridi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c618d3a8-d75a-40cc-98a6-d3cfcb4c2084/diccionario_latin_espaol_vox_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b879d481-d796-4e65-b674-4a51a3a90700/nigakaxujoroju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d4a88d-7c44-4e3b-90d5-f21911d3ef03/24817085913.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/joint_uniform_distribution.pdfIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_964940602bcb4a29adfe0b331c2661a1.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_d48ba4dbf4d04aa583ddaa2a19390cc1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6c681b-7500-4700-97e3-cc0a5cf9f2b4/65711645919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4653189-a951-49a4-bc9b-358f5b2a3ecd/resumen_del_capitulo_3_de_la_novela_cronica_de_una_muerte_anunciada.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_d85671ca7a944305a122c31f6cbc7b00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/001aaa5d-6a46-49d2-8334-fb8f7b0800ca/brother_mfc_240c_maintenance_mode.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_5b289537f2fd49c18c52d61f5d6e6b27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f04a5a-7710-4049-bb13-6be017e46ffe/the_magicians_cast_season_1_episode_6.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_c9f69daa781d46e2a72e1a421e41aef4.pdf?index=trueIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_717bce89108d417e8d28a98ba3c85d98.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_cdb6189d77024d99964c2c64c768b12c.pdf?index=trueIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_b2a1acc1ad9142c5af3a4b75441d434c.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_5ce0f359ae2342ad8530febdde223669.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_76f88c0243834f0194e1d5b46bb1aee5.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_2ee5c996cad34795af4fc2ea09fbf112.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19bd434-2937-4b71-ab65-67050c959181/que_numero_es_el_buzon_de_voz_telcel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156e82d8-dd69-4858-90cb-329574a5eb59/ps_i_still_love_you_netflix_release_time_philippines.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_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 5588 bytes
SHA-256: 47695ebcfc910545d9fa4665d18c2af86b9335af64d08a9210ab17a440153b32
font_01_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 11968 bytes
SHA-256: 2e6f8bcc02992eda87e6818bb3d9d52d4ddac6f5b4b4ce9a1ab4c74a7a39a5fe