Malicious PDF — malware analysis report

Static analysis result for SHA-256 686bd9dcdf85a83e…

MALICIOUS

PDF

85.9 KB Created: 2021-05-01 17:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 57d8111fef224f419b44de0ca205f8c1 SHA-1: c612aa6f250cb28a3163b9f05b908191f2461bf6 SHA-256: 686bd9dcdf85a83e0b10c369a1dce846f7ed47f4eb978d54f35c11c091bafc49
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to contain text related to the embedded URL, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://midufefew.ru/strik?utm_term=little+fires+everywhere+book+sparknotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418746/normal_6000c4bfa1172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_603fec8d18419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_60200795d7e97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_604496d9808e8.pdfIn PDF document text
    • http://rinavorepem.iblogger.org/how_do_you_draw_a_realistic_rose_step_by_step.pdfIn PDF document text
    • http://nawemalap.22web.org/how_do_i_reset_my_canon_ink_cartridge_without_chip_resetter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_606221c73beb9.pdfIn PDF document text
    • http://xuzugukow.iblogger.org/zarejetusoduzef.pdfIn PDF document text
    • http://nejepogiz.iblogger.org/63950151558.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
    • https://uploads.strikinglycdn.com/files/38df0f07-2462-4728-9131-8e0ea9935f6f/aspiracion_de_secreciones_por_traqueostomia_procedimiento.pdfIn PDF document text
    • http://rifukaleriduji.rf.gd/75010763807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e0cfe8-b0d4-4fe6-b254-37cd44df2004/wekeramexe.pdfIn PDF document text
    • http://witugida.rf.gd/difference_between_mini_and_standard_dachshund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3879c1-d70d-4da8-a0b3-e520907255c6/cules_son_los_sntomas_de_cuando_se_te_cae_la_vejiga.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/mikifogubawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6032d568-0553-4361-a61c-cd92fcebde3f/romeo_y_julieta_cigars_no_3_price.pdfIn PDF document text
    • http://tinijev.epizy.com/wigutanetukomoworovoli.pdfIn PDF document text
    • http://pafomuwi.epizy.com/bumonokepar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2315a5e1-52c6-4f7f-917e-6668c53182b1/volvo_penta_sx-m_repair_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 5176 bytes
SHA-256: a9cd78709a9ed4e054a2d91a59406a5c4064c48b3fb9d52bbdae243fdfc13c6f
font_01_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 2140 bytes
SHA-256: 3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 11852 bytes
SHA-256: aa45a995f9ac28a931665f50bf797d8b41bb4d1f735b3806eed3b64a40a53f3d
font_03_sfnt_off00013bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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