Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c43461dbb4b53d…

MALICIOUS

PDF

67.6 KB Created: 2021-06-08 21:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 936bb11779be8be2503df92b228126ec SHA-1: 2c37b8944e8b06255e113845a48228957b4b652a SHA-256: 34c43461dbb4b53dee6aa7b6f00fe47712bd54e58283cae49ffc163dce7bbd44
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/pbw?utm_term=mary+l+boas+solutions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413986/normal_600b3fad0c654.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/2148860.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462037/normal_60b4b1c9be054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421040/normal_5fe03ea6efed5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5ff0be25db81b.pdfIn PDF document text
    • https://xomunulozesini.weebly.com/uploads/1/3/4/0/134018183/23e353e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458848/normal_60493d687aa42.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/53c6ef8.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/0ccc0ec5-509f-4f7f-98df-e3c5044be6f1/tujefuxede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae7f8d4-1a18-4a03-b4a4-999e5c02aa92/narrative_of_the_life_of_frederick_douglass_summary_chapter_3.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/f/22887099160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e122c26-696c-492d-8210-a9f598fb3820/89102098625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7413c1-dc05-4bff-b180-8c8de63cdc7f/c_snake_game_source_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929d7ce4-71b2-4bb6-a8cd-f864b5d53c1a/dimobez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4731adc-94b4-46fb-afcb-d138a9170fd4/sideroliba.pdfIn PDF document text
    • http://sufasujozu.pbworks.com/w/file/fetch/144648570/80538255498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e980cbad-c138-458f-90b0-6f5bd5e22ce1/97839300497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bcf57c-96c3-4484-b6b9-dca14f47fa02/ibn_kathir_english_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4243f592-032d-472c-93a8-0a2f8cf6999d/xerafiwezumigajebolukapuk.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/97570837480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b0663a-1766-482c-bd53-541573c28c56/24125668427.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_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 4928 bytes
SHA-256: 758e5121efec5c834b9fa4e4f5684066e04c2293f592cf158c86b7f6b2055d49
font_01_sfnt_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 10116 bytes
SHA-256: 315ad51823bf9241ea02df91b9e3a958abec1ba642e4eef0154923879438062d