Malicious PDF — malware analysis report

Static analysis result for SHA-256 5754ba04643b442d…

MALICIOUS

PDF

82.1 KB Created: 2021-04-01 23:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 34a2452d8a36625bb808dc966256d566 SHA-1: e71f7d6262522e7b2da374297dbade8d61ee7e94 SHA-256: 5754ba04643b442d48827297957ba26a6e89cdce63b4259612e5d5d52dc0646b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to potentially harmful external sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many hosted on disposable domains, suggesting a phishing or ad fraud scheme. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to exploit users through deceptive content, likely initiated via spearphishing.

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://druttle.ru/123?utm_term=monetary+guidelines+for+food+stamps PDF link annotation
    • https://cdn.sqhk.co/kulizuxekume/jgiijhj/mewojarozed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497109/normal_5ff55b1c2e9ab.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/jididirefiwanikod.pdfIn PDF document text
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/3b2b279e7.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/hfiN7RP/50349916963.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/b3839b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451970/normal_5ff27880a5eaa.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/ruweworomazebewefupek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_6060c52c7841b.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/skhaibo/alaska_iphone_wallpaper_hd_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/XiafKgc/gixusus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485822/normal_5fce88408354d.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/931252.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/08e5101da66d4e5.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/84cfd238b66e.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/19315845162.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/kiss_the_rain_sheet_music_flute.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/8057096.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450251/normal_5ffc50bd1b3d9.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/jdcjbAJ/93304404424.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://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_7ed2a1f8b3d24f26ac8d20706329819f.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_f033bbf2cad8484b9c95aa0271fcbd92.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_11b8701dc32b4f98aa36d8663ff72217.pdf?index=trueIn PDF document text
    • http://najukelosuned.myartsonline.com/bridges_math_5th_grade.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_2fd200e9996f49d3a50f1386ad78fe7e.pdf?index=trueIn 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_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 5348 bytes
SHA-256: 81c92e9fb5c3fdca157ce2c42f82f71e1c454da7e8516298bbd7d4d6e83aadd0
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10780 bytes
SHA-256: 23a49ff586afa7457e2e08c17393c8bf914c79522b6358db262eb021364d8e5a
font_02_sfnt_off00012be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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