Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fde24e60fef555…

MALICIOUS

PDF

86.6 KB Created: 2021-04-02 11:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a122e22fd64c2080d4bb443628ef85b2 SHA-1: d101f1b729d9a32805a89bc470b870340be85192 SHA-256: 64fde24e60fef5554cf4f199b97fa6e21efdf7bd4816665c1aaaff93965383c2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'resalured.ru', suggesting it's designed to redirect users to a malicious site. The document body, though heavily obfuscated, contains keywords like 'Baltimore subway map pdf' which likely serve as 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://resalured.ru/award?keyword=baltimore+subway+map+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390330/normal_5ffd2a274bb27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_5fe8d9e5eb6c6.pdfIn PDF document text
    • http://lg-copyrightforms.com/free_printable_math_worksheets_5th_grade_fractionsoz3em.pdfIn PDF document text
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/lamakakibow.pdfIn PDF document text
    • https://toriradusug.weebly.com/uploads/1/3/4/7/134744904/purulubososuma_kereboxinekofo_zadarebafojujim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_603464f525f2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421937/normal_5fed2a66647cd.pdfIn PDF document text
    • http://buloshnaya.site/wnlb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_603c37c7532dc.pdfIn PDF document text
    • https://xanojamazifedim.weebly.com/uploads/1/3/5/3/135323589/dukidobadogaje_kukomegu_mukulix.pdfIn PDF document text
    • http://clobuss.ru/gonokmorne.pdfIn PDF document text
    • http://tonagruz.ru/how_to_use_bissell_proheat_plus_2x_revolution_deep_cleaneruh5ev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_60527e5d662f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_600fd0d93d678.pdfIn PDF document text
    • http://swiss-gear.store/kevin_bacon_invisible_man_jokexf134.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/23676277608.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/tresors_du_temps_niveau_avance.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/zixoluv.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/fitted_sheet_meaning_in_malayalam.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/32619683216.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/angular_formgroupname_ngfor.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000132fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x132FE 17464 bytes
SHA-256: 78c87e418587294532667e1cb0cb61c89725c8f41f80f3d6d4ce678d6241a277
font_00_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 5568 bytes
SHA-256: 362180f5fcf3d816771ecb7fd70fcceeb517699c4146ee7c29983f8077d6a491
font_01_sfnt_off00010ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 11196 bytes
SHA-256: 53841d9a197bcd136c67b735c06609c2996278d2dabb33378997b17d4c41058c

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