Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4774b741728db13…

MALICIOUS

PDF

72.0 KB Created: 2020-12-28 18:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1b03353f6fc5d47f2d9d06711ab33139 SHA-1: 3ec48401f8b436bdb07aeda806896802b0a46cc3 SHA-256: f4774b741728db130cc4606dfccf85c34fb9863aac7b1a1596eb46a468c31794
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. One critical heuristic identified links to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=reaper%20death%20seal%20sl2%20spawn In PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/lakumilevajegik.pdfIn PDF document text
    • https://bekaxerovesujes.weebly.com/uploads/1/3/4/8/134856890/nizubaronix-sulabazasosodaz.pdfIn PDF document text
    • https://tatimaguk.weebly.com/uploads/1/3/4/7/134718839/tetorakivaf_nutujomomaro.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/fovibibupudu_revokojures_fabon_vaworizajiwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f8cbaf51c3a3.pdfIn PDF document text
    • https://rotuvose.weebly.com/uploads/1/3/4/8/134849004/wepisiwinuno_mabuvexalonede_gedikowonaze.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/ninelujadusosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405650/normal_5faaceabcc509.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/25212a15-652b-41cb-991a-bc2b64800ff0/gadipar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a0373c-482d-4a4c-b4a5-2d5e7d1a52bc/fat_baseball_player_running_bases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5de38b-4e89-418b-b542-1f664c0ba60b/27890765577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0995430f-a3bc-4299-8970-da0dc04d33fd/ccsd_schools_my_portal_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e72471f-c06e-45c9-bfc4-8524df38136d/78144305359.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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5276 bytes
SHA-256: 47482d46e1d7aafdfacf4e1d0d4abaf38af34a46b58b9f1a135e0ce3efbf10dd
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 10304 bytes
SHA-256: 4d506d7301f53d67db97e03ea5ca2bcac104f1b6d4a854beff5a1d9d145790e6

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