Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cd7e2604ead255…

MALICIOUS

PDF

81.2 KB Created: 2021-05-28 01:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c013d62ce0fd1c331268aa17c0733bc2 SHA-1: 75d85bf110823de0ed4c499e8fff563cd0ee276c SHA-256: a7cd7e2604ead2553a052c1077edf41b09114128a26b06d3b9260810908f68d2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://bologen.ru/strik?utm_term=why+is+there+a+limit+to+trophic+levels PDF link annotation
    • https://bamopinusomuna.weebly.com/uploads/1/3/1/3/131379567/25d9128faf0.pdfIn PDF document text
    • https://xitokudid.weebly.com/uploads/1/3/4/6/134688137/a68d6ac457c10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6028133eb46de.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/3635917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_6054ba1d82955.pdfIn PDF document text
    • https://veriraxitinori.weebly.com/uploads/1/3/5/3/135394444/sitiwusajox-togix.pdfIn PDF document text
    • https://narimokilef.weebly.com/uploads/1/3/4/6/134603618/8167993ee.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/43a75b417ab843.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fcb9865b1619.pdfIn PDF document text
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/0788e36.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/biribijelususap-folasive-kajoxarog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_5fdc80ad220e8.pdfIn PDF document text
    • https://zabutamudosuwox.weebly.com/uploads/1/3/5/3/135345211/710583eb865e.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/nafenosetirete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_604ab2ddcaabb.pdfIn PDF document text
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/dakekiruzizi-xowizewodejo-tewezis.pdfIn PDF document text
    • https://jenodefutufute.weebly.com/uploads/1/3/4/3/134373351/lukelujuwobovanikuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_60245dbe7a40f.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/f53c8919-201d-4df1-bfc5-e1631538944e/hp_photosmart_5510_not_printing_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b520cba-2770-4ed5-94a9-7e2e2182567e/ethical_hacker_salary_in_india_per_month_2020.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_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 5348 bytes
SHA-256: 4aacbe5edf6a51367fe01587cae7ebb8a2d8dbb15d9bfad4f212f57157a1bc09
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 10468 bytes
SHA-256: 31d4befc9e98fd9f055ccc8599ea5793ba09ddd184a4812ccf3b2f0200724e10

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