Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af70d7da7eb138f…

MALICIOUS

PDF

72.5 KB Created: 2021-06-08 08:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7742630df355f65739cc5ff0fa3ea60 SHA-1: dca4226b4202ee3cedc17ddd1bbb1e290dce9037 SHA-256: 5af70d7da7eb138fb3cc66bb90ce4acca3d91e6ecfb5ac229d2a182d374f1caf
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://crysiq.ru/pbw?utm_term=bible+female+names+and+meaning+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418791/normal_5ff5be43de796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_603f3f909fe4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487424/normal_604cfdf28e3c3.pdfIn PDF document text
    • https://bujopovuw.weebly.com/uploads/1/3/4/3/134390204/zixojajujiki.pdfIn PDF document text
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/nifozotom.pdfIn PDF document text
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/wabevigijiv_pepojisonema_siwogapul_sorepo.pdfIn PDF document text
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/baxupurideb.pdfIn PDF document text
    • https://bogatawokajo.weebly.com/uploads/1/3/4/9/134900502/jobosaweguvaruzozuje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fd05cc532a85.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/xabomifujid_rezarudabisok_bisib_fujomuvapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_5fce94eb8e08a.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/966d97c3-0e3d-42b8-86b6-78b429131f83/besesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6688ef-5e6a-4f37-866f-b230f07dc7e4/70442698259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eddb9884-2147-475f-8564-4cd0cf5d1968/kokegekavuwufovatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd63b2e-1bb0-41af-a3c0-c179d3a2e6f1/study_guide_algebra_and_trigonometry_structure_and_method_book_2_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d40f3e-79bd-4f56-8367-94a59f70a3c9/spending_a_lifetime_with_you_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa46ca1a-d453-4133-a6d1-fa7dec92b4db/14184367161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e96efc-1629-4a63-b39f-72740cfebc3e/vogejekebagevikurasavek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1edf05f-eef2-4617-a858-b24138cc09d1/samsung_wf42h5200ap_a2_filter_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e184dbe-416d-49fa-bca6-774f1d60b105/30585123088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b8b7d7-02b3-4345-bfc1-7fd4b0470673/general_biology_photosynthesis_worksheet_south_sevier_high_school.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_off0000deb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB8 5452 bytes
SHA-256: b310ae14c8f3aaf432c2c390b266b6ad3815e67108ed6de3663f1a1bbb5c42d3
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 10384 bytes
SHA-256: 44165acfd485b60bb34a9f96fee96715daa7daed2dcac2113bccbc54bff673c9