Malicious PDF — malware analysis report

Static analysis result for SHA-256 6858363debdc9435…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 07:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f89102a1f4bce3a96bc7cf3fe3e4cdeb SHA-1: da7e924389fb6e3878013caa1d831f7e0ef2f631 SHA-256: 6858363debdc9435bfae45ff9c9bb439c9a87620cd50042993d2820a4ffd9bf1
194 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/strik?utm_term=doctor+faustus+full+text+with+line+numbers PDF link annotation
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/pajagutif-sibaredumigisav.pdfIn PDF document text
    • http://openplafond.xyz/gre_practice_math_problems_with_answers99y1h.pdfIn PDF document text
    • https://xevoniwibefi.weebly.com/uploads/1/3/5/9/135984774/6983291.pdfIn PDF document text
    • http://edarudost.online/wulamemedipirazox73v8.pdfIn PDF document text
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/7080752.pdfIn PDF document text
    • http://energierecrute-emplois.com/55940569455z10d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_5691e47af2ac45749950d5ed45b0ab39.pdf?index=trueIn PDF document text
    • http://gevuragerok.epizy.com/explain_elastic_and_inelastic_collision.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_d007ee71c1214a15b6e37af472b09bd4.pdf?index=trueIn PDF document text
    • http://mujigakevomo.epizy.com/99_kannada_movie_in_tamilrockers.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_e0edf0eb78ed42e0af7c12d37ea2de91.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_bd67774a13f640519257afc19c2c4591.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1815d026-a909-4e83-a828-17ee0bf26c83/71055028805.pdfIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_096b8aed8c1c417aaacbc840c4e4c07a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aba8118-2576-47cc-bb9f-7e4fd3888cf2/59046162419.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_ba329fb3b9844e4586d01b6b9a9a10f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1dddc1-37cf-4162-b836-1389cf71fa1f/witcher_2_ps4.pdfIn PDF document text
    • http://dopapaxejoj.epizy.com/collecting_memories_wow_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6009e2ce-50c3-4818-8819-37586493d1ce/44042681791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc590e44-f8c1-4ff3-a511-466de8b1ac3b/34000293852.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_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 5420 bytes
SHA-256: a5aac2401819d41ca0682a7e8b84805de0a40c56c4c5af6b81176d56826dad0e
font_01_sfnt_off0000ffc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 11948 bytes
SHA-256: 1d59bf9642f9ad509312ac6f2c9510e4493babfe6cf790f9a2f5745dfb95956a