Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea20dbf52440702…

MALICIOUS

PDF

79.2 KB Created: 2021-01-16 07:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8f2151d35f899fabf92848457eb8c473 SHA-1: 945250d9645716ab00db7357df310be930d5e50a SHA-256: cea20dbf5244070294d5a4277b5d26b02eacd469cd9971a24a7ceb4e2f5b4e5d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous external URIs suggests an attempt to redirect users to malicious sites or download additional payloads.

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://trafftec.ru/123?utm_term=member+count+bot+github PDF link annotation
    • https://cdn.sqhk.co/kuxefoxo/9ghjcrc/98352490474.pdfIn PDF document text
    • https://site-1199448.mozfiles.com/files/1199448/ropilakosej.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/4fd2998a502e9e.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/ZTKdpA0/diseweniladeripor.pdfIn PDF document text
    • https://site-1166752.mozfiles.com/files/1166752/lilevafutitaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420468/normal_5fa210694ca1c.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/bFF6Njj/chocolate_cake_recipe_with_cake_mix_and_pudding.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/f2213eafb090.pdfIn PDF document text
    • https://site-1176577.mozfiles.com/files/1176577/wubisanixibawob.pdfIn PDF document text
    • https://vagesazo.weebly.com/uploads/1/3/4/7/134747595/1740751.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jhibGmF/16491166385.pdfIn PDF document text
    • https://site-1175608.mozfiles.com/files/1175608/best_notepad_app_for_windows.pdfIn PDF document text
    • https://site-1175914.mozfiles.com/files/1175914/nbc_sports_boston_jobs.pdfIn PDF document text
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/pogotosaruzeb.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/lejoxelekulime-zenil-vititapobevek-xewemimikota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 4940 bytes
SHA-256: 089f0f0ac2573d966655eb5f58eaa43d77de646dc3273f25c5905cc64a1e3f69
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 1920 bytes
SHA-256: b360d73ad526846d66f4cf12690e199ff8f001348b5a60117a3b0c293c15f912
font_02_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11396 bytes
SHA-256: da730b458376eff68c84e64c03d838c40e1998d7e944a68603cb48a8b9b0ed8e

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