Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf1cd3b8c0c3d19…

MALICIOUS

PDF

65.6 KB Created: 2021-03-22 19:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9ddbadd164bd412e95feb77c862b5d06 SHA-1: 22c4af8c11198cff08df478107c521d8d607adf3 SHA-256: daf1cd3b8c0c3d1946a3b68c9c9458435a9ae81fa338359a9f61e0aae34fdde3
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

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://xezojetit.ru/strik?utm_term=1994+polaris+trail+boss+250+parts PDF link annotation
    • http://palopepidek.mypressonline.com/64843371423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_600d4304d1baa.pdfIn PDF document text
    • http://xizugef.medianewsonline.com/body_parts_coloring_pages_for_preschool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc72a79c953c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6033ff5c66ae9.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/fonosixutevedifijiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_60138096b0be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_602d2116e2f44.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/o_dirio_dos_escritores_da_liberdade_livro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_603e5d24018b0.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/269f74c4-437b-40af-b177-28ab64cf94fc/76730710797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4c8891-1d21-4b9e-adb4-166d005f1b31/99695144322.pdfIn PDF document text
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_4d88fcca3f2842508c249f1b774c62d4.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_542e2a5b2f0644e4aed0d2a2aadec606.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15C 5552 bytes
SHA-256: 4b79aba7be69ab8604cee820cfb8cc660d7575a083aef61ef4c7be1c9ddb6286
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 10936 bytes
SHA-256: f4a69331eff0fb8eb79421444c323ece04e93c11de5f4d9c01401867badd1a1d

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