Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c426ca29ccc985…

MALICIOUS

PDF

77.8 KB Created: 2021-05-04 10:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f0538e6ce6a9d359772cb352f48a29ff SHA-1: 5b11e40ccfee9635def1d1a65c2e4c9693b2d6f9 SHA-256: a0c426ca29ccc9855224c3182f432ad5204e3aadab97f690941b6aaf8b1e90de
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=le+comparatif+et+le+superlatif+en+anglais+exercices PDF link annotation
    • https://jarubobukifali.weebly.com/uploads/1/3/5/2/135297267/jukoxizagufapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_606526bb4f266.pdfIn PDF document text
    • https://kadexatazi.weebly.com/uploads/1/3/4/6/134648676/a3aa9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6063a7133c4bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455883/normal_603886343c8da.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/dsaBzha/94640897381.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/ihfkgjl/11088895260.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/nesinaluvi.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/U5hihgm/jujanejekepareganapitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_6045c8ae5a97c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_6014f308bc439.pdfIn PDF document text
    • https://kazowajobizitat.weebly.com/uploads/1/3/0/7/130775795/1124376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_6050173fe5553.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600b54667ce47.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_089ddf97ae794b76b589fd4ac124b45f.pdf?index=trueIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_d15f5bc6a4154c5e90051a619afd09ad.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_e26453a7180741779a6377dde0e3f158.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/amaze_file_manager_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/frozen_part_2_full_movie.pdfIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_406e009e025643729f3faf7c32be986e.pdf?index=trueIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_368315379c1645a895482da7d12e9564.pdf?index=trueIn 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_off0000efd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5344 bytes
SHA-256: 5d8881d70515f12ac54940897c25b5203fde9b997c5fe51a7dce8426a5a3a453
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11404 bytes
SHA-256: 5f085f8ccb4048479e18a5cca31cf729c1a29fd3300289a647709607b82fd140