Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01ceb0db1d6b1f8…

MALICIOUS

PDF

90.9 KB Created: 2021-06-05 12:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bf0a38e61341eeef7e05aec5fb656e1b SHA-1: ea0f143da19f066e717b2816cd232067693b1bce SHA-256: c01ceb0db1d6b1f80fa0b0c0064d732cd67b35a22aa5210d99dbd1dc78f11b3a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the mass external link farm. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://ponafet.ru/123?utm_term=faa+drone+practice+test+answers PDF link annotation
    • https://penatiwateli.weebly.com/uploads/1/3/4/6/134617533/zijaxil_nuziwejid_kibupapuf_vukegepotumedun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415068/normal_60620887b74bb.pdfIn PDF document text
    • https://tapojanez.weebly.com/uploads/1/3/1/3/131398133/cb7fa4409a.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/kajikolaseputadozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_606e52ec4dff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60133c1c4b753.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/suvigote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5feaebd830938.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/42ca2c6ccaaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5fd9f1e1e4002.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/tovemob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_6037f14631fa6.pdfIn PDF document text
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/7092557.pdfIn PDF document text
    • https://gebotela.weebly.com/uploads/1/3/4/3/134318039/604bc176f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144572172/jogos_vorazes_a_esperana_parte_1_download_utorrent.pdfIn PDF document text
    • http://gitefov.pbworks.com/f/ionic_bonds_practice_worksheet_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa47d3f-01f9-43e1-a50c-a10c40c75dc0/turizogazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f011be9e-c61b-4c61-9e62-79249b582b51/time_management_strategies_for_high_school_students.pdfIn PDF document text
    • http://zemilenasi.pbworks.com/f/what_are_the_3_major_ideas_of_cell_theory.pdfIn PDF document text
    • http://fotowefufet.pbworks.com/w/file/fetch/144641157/what_is_68_kg_into_stones.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/gofobakave.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 5080 bytes
SHA-256: 968e38c7297f68a5773f2d487f59256153454dcd1feaf13c15ad44ea373f21a2
font_01_sfnt_off00013762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13762 10996 bytes
SHA-256: bd9745c50e6e27203c4b424e78bbaa2f700e5ecb39c6543cefde559d153143ea