Malicious PDF — malware analysis report

Static analysis result for SHA-256 309a1f8c1d3da16d…

MALICIOUS

PDF

70.9 KB Created: 2021-06-08 17:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: be28e26c2b3809ba94e1e7b98ad22ff9 SHA-1: d6fa86bf6a34d6bddbfdf2bfcd2117066c4dc9d9 SHA-256: 309a1f8c1d3da16d569d7c82b1280e071ce01c8d3ec31928355938a5010d2678
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains multiple external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment attack pattern, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/pbw?utm_term=ap+biology+exam+review+guide+answers PDF link annotation
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/narosizopunopi.pdfIn PDF document text
    • https://dogerisu.weebly.com/uploads/1/3/0/8/130874322/2a7a56da9ab.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/660dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_60bce6cc91f03.pdfIn PDF document text
    • https://tisexazom.weebly.com/uploads/1/3/2/6/132682329/xozomej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486365/normal_60417692896b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc652911-651b-49a2-81aa-5279bfd4cb41/dirt_devil_power_max_xl_vacuum_belt.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144502629/vafemovurimibavipido.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144419082/nasabijud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecece64-558c-4440-8073-710a5ca710a8/basic_english_grammar_workbook_betty_azar.pdfIn PDF document text
    • http://nawujewo.pbworks.com/w/file/fetch/144783318/58316722129.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/gezurutajofuvofaralirug.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144589398/9596287879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cf17d8-f231-4649-a358-14b7d3a01ffe/how_to_make_a_simple_machine_with_household_items.pdfIn PDF document text
    • http://wexagiz.pbworks.com/f/what_is_the_4_digit_code_for_a_sharp_tv.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/13200334300.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144497997/ehsas_kafalat_program_2021_online_apply.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/w/file/fetch/144501411/tizata.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 5728 bytes
SHA-256: 7ab5e51f687b1f4f8002ca943c2c88e1b37275ab803122b8dacafbb5d0f2614c
font_01_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 10160 bytes
SHA-256: 95d5d7dcd85121e9c8637295bad779b29648cdb2db6debcf0e8b8d9761bffb90

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