Malicious PDF — malware analysis report

Static analysis result for SHA-256 5868a02e7dafeb21…

MALICIOUS

PDF

73.1 KB Created: 2021-05-28 11:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 018faefaad2419f359fd5cf6b184f43c SHA-1: 558710bc692f0b9a293016ae6841cdc00ac7edf2 SHA-256: 5868a02e7dafeb2159cd6ad86996049d920ea02061b019d788ecc02238431189
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://crophysi.ru/123?utm_term=slidehunter+ppt+templates PDF link annotation
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/4468560.pdfIn PDF document text
    • https://wilexezixokesu.weebly.com/uploads/1/3/4/7/134764798/45df80a193f8aaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_60275218888cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5fc5c51306c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fd2e41b9b251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_603917e43dcb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_601a9af44991e.pdfIn PDF document text
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/1d81e7a1c1a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468268/normal_601305035ef48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_6059faaf1b96e.pdfIn PDF document text
    • https://fejawizekojiwi.weebly.com/uploads/1/3/1/4/131438151/tasojela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fff48909c9a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5fd3c2820db7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376379/normal_5fe0ffd93165f.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/4976004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_602952560404f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369498/normal_5fe5d3f66f371.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/ca0beb24-7348-45a7-b262-719f959167a1/vowofopava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2b36c9-bf73-4818-878a-4354e3d88529/madison_vs_marbury_case_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883afde2-d80c-4416-9d51-a7f5f5687e3b/ruzanosag.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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 5304 bytes
SHA-256: 7bb76d0105512bacf1660423a7fddb549d4d9e31771bb7c1e1c7e79a600c3921
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 11340 bytes
SHA-256: da86fd43a83c3b26fd4daf45b8004f723c7c115688386ca46756945387d6cc4d

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