Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de5535620eb931a…

MALICIOUS

PDF

157.0 KB Created: 2021-05-15 23:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6905b0f0d4c54dea8ab8283f9398a678 SHA-1: 26eefa82149da39001447c248e9c28f8ae3ac430 SHA-256: 6de5535620eb931a021ed931ded78668e5bf30ab4e1621b7279b7cd4a3c4b99d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document's primary function being to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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=chemistry+of+living+things+chapter+6 PDF link annotation
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/zetumo.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/100d9.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/what_is_an_example_of_scientific_literacy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_605d991f82c15.pdfIn PDF document text
    • https://zafubunemajuz.weebly.com/uploads/1/3/5/3/135314528/c0d5c33db23c.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/7a2775e674a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60673dd79631d.pdfIn PDF document text
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/ruvutexufitesir.pdfIn PDF document text
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/saxekixamo-mizal.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/zukemozeto.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/fb6b4d7682356d.pdfIn PDF document text
    • https://gejixivipoza.weebly.com/uploads/1/3/0/9/130969358/9206347.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/7329509.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/lagoxemofubeba_mojuf_butefed_worareximosufo.pdfIn PDF document text
    • https://gotagifegu.weebly.com/uploads/1/3/1/6/131607164/zinezepolujuxap_tirefojafewa_busilotu_ruwebafupisuxel.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/fiwebofokej.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/35625019274.pdfIn PDF document text
    • https://dojosofezi.weebly.com/uploads/1/3/5/3/135390984/wepom.pdfIn PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/7561926.pdfIn PDF document text
    • https://lizuxafemow.weebly.com/uploads/1/3/0/7/130776517/4531603.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/activiti_bpm_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_603ba89cdd388.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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
    • http://sabixukavizom.myartsonline.com/vifiw.pdfIn PDF document text
    • http://sudexixurijaxoz.atwebpages.com/archangel_s_storm_free_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F74 1684 bytes
SHA-256: 4d3fb6748bdbfc0676bbc246a341b567ec3707c335db72ae26270b639488ab50
font_01_sfnt_off000217d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217D8 5556 bytes
SHA-256: c0d9ae414ea0d3f73d3a598c234d3b40d57c542b68c5fb05fbb543303d194189
font_02_sfnt_off00022aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22AA7 13508 bytes
SHA-256: 44a9da273161d777b0396ca175fa3144033801084d78988329cd6f17602d0889
font_03_sfnt_off00025758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25758 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333