Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f26b44176eb400d…

MALICIOUS

PDF

86.0 KB Created: 2021-05-09 20:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 224a02b60549eccee37a1dc926a322cf SHA-1: 21d478447b2cf267519d7b89d976200598d67203 SHA-256: 5f26b44176eb400dca2079ad2b0bfebbfc6ee385e42c2f9d254dc91db13b9aa4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs points towards an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+fold+chicco+mini+bravo PDF link annotation
    • https://cdn.sqhk.co/bemaxopig/RihZjiY/77061764488.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/haig8hf/51650169471.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/Lbgh6Ey/chemistry_intermolecular_forces_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_41f296c9e5944cbb857a2ac9dfbeaed4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1371f2d-de2e-4609-93bd-67de42322557/2008_jeep_grand_cherokee_3_inch_lift_kit.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_e5df3d465f974a8ba1b26090f9dc604b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/best_quranic_recitation.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/71462007594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab40266e-e393-44ba-846f-6f3c30ab0788/free_large_printable_numbers_1-100_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/jejusejusitogotalibu.pdfIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_d0c39e78a0ab480f94610eeeaf207fdf.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_a7a0385bb06f482395b0fe6e5b11c839.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/19564443887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4f1a7ea-5ae6-49ef-819c-2d388afc6715/howls_moving_castle_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/watford_vs_arsenal_highlights.pdfIn PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_4303f577526444e4b1489b6d2c2e33ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/belajar_coding_lewat_android.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/33910735162.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/59420227191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89cbe014-12a9-4bac-b113-ccd26123e333/rajolasoxovevemetapi.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_cf57cb057b0d45e4bad663819fea0c53.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/titugome/how_to_play_blues_harmonica_key_of_g.pdfIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_3a1e5894bc90462d98a58cf4d19a52d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabevog/mowurebalababurib.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_71805d05cc754a35a6e4076305927c82.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9cbd93b-4bd3-4119-8f7f-11c4a47dc789/60474192351.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 5336 bytes
SHA-256: 060913957a28b5629f57c5c51991d7d57ec11405a403aa35f1aebe264c7a2a92
font_01_sfnt_off00011c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 1904 bytes
SHA-256: 6034fc9aeb0d941349970ec807cd2b709a4aa93e61ae9bddcdc4f8018050c39c
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10768 bytes
SHA-256: 85c7b15fb2206ddd189468f747d7950b55b6fb6724b9ea2f336f72ad07e86b64