Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e208f8e2a147029…

MALICIOUS

PDF

75.8 KB Created: 2021-06-02 04:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2a46fec92327891c5f6c170f4267fb25 SHA-1: 1b171876e5a69882e90bd73cd266a898dc097f7c SHA-256: 4e208f8e2a147029abc23065a3a027d2c0e8bf5542bf17b177d0f9a651ee76c4
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized content or redirect pages. No scripts were extracted from this sample, but the extensive use of external links suggests a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/pbw?utm_term=realidades+1+capitulo+4a-3+answers+page+97 PDF link annotation
    • https://getavefab.weebly.com/uploads/1/3/0/7/130739632/tedodege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489032/normal_600690850a7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_60198cabec4e4.pdfIn PDF document text
    • https://nijusalelazi.weebly.com/uploads/1/3/4/8/134875584/1703017.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/jafided.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/voropetovuzize.pdfIn PDF document text
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/vatiz.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/d015899b-bf69-4db8-af50-0ca39252fc0d/85985117526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f672d0-a988-4829-892c-cd8f2fda92c5/musica_de_avivamiento_bogota_colombia.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/ejercicios_de_convertir_de_numeros_decimales_a_fracciones.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/misplaced_modifiers_and_dangling_participles_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b126b0c-151f-4572-9c38-68f5e87332a0/30_day_eviction_notice_template_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2156fe0d-0d26-440d-b10d-0fd468444d8c/66046330406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1241eb-2ee0-4e83-aff5-1b6f969f5414/how_to_port_pictures_from_android_to_iphone.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144485361/what_is_the_major_difference_between_gymnosperms_and_angiosperms_in_regard_to_their_seeds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abcd19c0-0080-486b-8bbc-903bb7890216/dijekeminag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd1f3e3-6ea4-4fb8-8925-e70127d7f91d/ge_xl44_gas_oven_wont_light.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/does_metformin_cause_muscle_fatigue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e481615-58ea-4394-895b-eaecec3e49db/complete_chemistry_for_cambridge_secondary_1_textbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69284ffd-efcc-4ec1-97af-44afb0d1f7fd/control_systems_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b6ee41-dc52-44c3-a88c-be9f0621ed55/gcse_geography_ocr_b_revision_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae179984-19fb-4532-8f3f-81ce6806b908/bukinajajuwuwekawali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af580760-9742-4eb1-b8a4-2dbacbdd5be3/63895081377.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e19be0f-71db-4ea7-b2ae-5955d5942bda/cisco_sg300-10p_default_username_password.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144484059/fovukoxapigafur.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_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5912 bytes
SHA-256: 08a28cda8c6ddbb4c4f57c16e796f8b62e3c9928c783e84d41d135df1563d030
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 11496 bytes
SHA-256: 8613cc7c541806b0ef5bc7027a9d0bb3b073a5c669830cd76f7314984fbef477

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