Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aa545a2958cde8…

MALICIOUS

PDF

79.7 KB Created: 2021-04-07 08:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f53f4a82c33414b7fb3e226277becc8d SHA-1: c1360de2becb68f491d30ab5621dc9439f219957 SHA-256: a5aa545a2958cde8163bfa58aaf50f96e78e1140ab4faf630abae6ba59033155
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://dugedepap.ru/strik?utm_term=non+destructive+testing+schools+in+florida PDF link annotation
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/rabumeperevonukifum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5ffdd3d8caad9.pdfIn PDF document text
    • http://iranianvc.com/kuwaxatarubenalacjkcs.pdfIn PDF document text
    • https://xuzabuteke.weebly.com/uploads/1/3/1/3/131379980/xivototaraselij_punokofatod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_603996325b51a.pdfIn PDF document text
    • http://cadenalia.com/application_video_browserkjfcu.pdfIn PDF document text
    • http://soldatskaya6.ru/xosimn8rch.pdfIn PDF document text
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/mudupenujigipiw.pdfIn PDF document text
    • https://bajixaxazuxu.weebly.com/uploads/1/3/1/3/131383864/weleputoxamelek.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/6351025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_6025965c678b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_604fbdc6eef75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_600d40f1012e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_6017a8cfd0fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5ff89acbf3f93.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/1e05f4ef-df9e-4046-96c4-d729c9b14232/american_journey_salmon_dog_food_ingredients.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_efcd18326d584586b774cffc16cbe55a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e65476-04af-4627-9b9a-ce48550a69e2/11091503227.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_f49cd091a2d345f8b1eed848bda5e8ed.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

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_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 5312 bytes
SHA-256: 13488f6616a4b47d29cd7255e3e8b582de91198c445e87765b04bb8ab96cc12b
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 11116 bytes
SHA-256: edf236738e5ad85742b8775e2293a34ca3a579fd6acd4f68a8d1578f521ac7b3

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