Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf9d1178eddf8fc…

MALICIOUS

PDF

69.2 KB Created: 2021-03-31 19:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3d7bb8456c608d705fe4859409209441 SHA-1: 6ea7edf477d07a80d7784e1003331b5166f4765e SHA-256: 4bf9d1178eddf8fc0e5340af198ec7ccf26c65d276bde396ef07fc6314dcf3f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites. The embedded URLs and the document body suggest a lure related to improving Excel performance, which is a common tactic for phishing or scam operations. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/strik?utm_term=how+to+make+microsoft+excel+run+faster PDF link annotation
    • https://cdn.sqhk.co/mewixamok/NWhejj9/brother_dcp_l2540dw_specifications.pdfIn PDF document text
    • https://fevepoxopimumu.weebly.com/uploads/1/3/2/3/132302951/2933a6470e.pdfIn PDF document text
    • https://cdn.sqhk.co/jategumeb/gwgfwhg/auto_gangster_mod_apk_an1.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/LxsKgh6/stack_the_states_game_map.pdfIn PDF document text
    • https://tomumexajozovod.weebly.com/uploads/1/3/0/9/130969356/susinabupo-wepewasa-lodilotun-rudojawuma.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/cS7giUT/kofanu.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/hGUZVgi/blackout_age_map_based_postapo_survival_craft.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/ibx5Kca/89463447005.pdfIn PDF document text
    • https://cdn.sqhk.co/famagafe/hgfgeWq/firobalisobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_70637931c8584eb09a9a3ddd741e7572.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f789c7-9cd2-41fd-9920-fe3fc13c1418/zebco_33_classic_parts_diagram.pdfIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_4a5ff9f2333c4e109f742729056450f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d618c2e-38dc-47d7-baf6-7185e92ddd0f/bagizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6087c22-7a81-4c5c-8960-7273e64965dd/how_many_calories_are_in_a_crunchy_taco_supreme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec4ccc1-6889-46db-bc6f-4d1450242baa/diccionario_ilustrado_ingles_espaol_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037fb321-d15c-401d-a81f-1bbbc94d6e83/production_and_operations_management_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81431de-db29-495c-ab5e-5b4a721e72b7/zejujelupebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31e1709-1488-4057-99f3-93e6c27db053/a_christmas_carol_2009_age_rating.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5212 bytes
SHA-256: 57a1ac591628ab47bc6e3b010a45ad33fcb4e834d0df3dfd5860862bcde42c18
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10516 bytes
SHA-256: e467aca2ff1cd92c3dfaa2626fe6e032aa9fe383985464e320a674dbf9128a9a

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