Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89441840494e53e…

MALICIOUS

PDF

94.5 KB Created: 2021-05-21 06:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5a31fc9c065ea19bfd558b060cdd52c7 SHA-1: b08fdf8bc1f203b0afea0ca7d5960c148377a24e SHA-256: f89441840494e53e8b8314599eb5d88cfb6195f136222689033f6bf588fccc3c
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 0.9995

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://nipisod.ru/strik?utm_term=luigi%2527s+mansion+dark+moon+walkthrough+a-4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485800/normal_5ff7084544249.pdfIn PDF document text
    • https://xijiruxexewige.weebly.com/uploads/1/3/4/7/134725886/d418067846e7d.pdfIn PDF document text
    • https://kiwewogulexir.weebly.com/uploads/1/3/4/3/134307720/6830614.pdfIn PDF document text
    • https://vemujevamari.weebly.com/uploads/1/3/1/4/131452814/vavuzejibow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5ff429115fc97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_602b395884909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6037ee16449e9.pdfIn PDF document text
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/mukuvitelutev.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/1475826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_5fe9f6588a9a1.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/gejefin.pdfIn PDF document text
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/damex-tubimibinijira-dafesin.pdfIn PDF document text
    • https://xisaluzesa.weebly.com/uploads/1/3/4/6/134602292/libirige_mabifutipakak_kowejobi.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/6252869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5093cf7e-7c02-44b9-a6fb-2b92f9d47fc7/how_to_get_fit_without_changing_my_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f2ecaf-004c-4a2a-a2e0-7275bb57f158/nosiset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b6b1be-465c-430a-80f3-b6686bf683e1/16209597741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce707771-b24e-4931-a87d-86200251d3c4/54077551409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b73a5d2-0662-4f1c-894f-baec3f721c27/safaladikevifomune.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/a1_coloured_card_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/83819199279.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12629 5252 bytes
SHA-256: f8e4a6b7a552bbb2a11c8eb04b20eba563a80f204ea39de6663fd15dbb4bb0c3
font_01_sfnt_off000137f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F0 11088 bytes
SHA-256: d7d6cb51906a87169525d9f566f65ecbcb2450efebaf4ce2692075d7c0f50425
font_02_sfnt_off00015df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e