Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76caca4bbe0ea60…

MALICIOUS

PDF

83.1 KB Created: 2021-06-08 02:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eb1ace86e5b2fe562bce6538d9311be1 SHA-1: b201b6d9bd2cab72b22fb31ef856c3da59d067f2 SHA-256: e76caca4bbe0ea60e49da98e784f916f09da4fbc20d4878a2192960d5b7bf0b1
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://xajibur.ru/123?utm_term=chevrolet+cruze+2010+service+manual+pdf PDF link annotation
    • https://penotogales.weebly.com/uploads/1/3/1/4/131438478/xuwitevifapu_nufev.pdfIn PDF document text
    • https://vipoferizapil.weebly.com/uploads/1/3/5/3/135346342/godadalenetuliro.pdfIn PDF document text
    • https://duxuxivet.weebly.com/uploads/1/3/5/3/135329622/nobovurew.pdfIn PDF document text
    • https://jezemukefanufem.weebly.com/uploads/1/3/4/7/134765918/7206872.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/04a5bca79ab8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_601b67b1a3079.pdfIn PDF document text
    • https://nekawosewifij.weebly.com/uploads/1/3/2/8/132815774/3437311.pdfIn PDF document text
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/lovevupi-jafunozes.pdfIn PDF document text
    • https://wukodotimage.weebly.com/uploads/1/3/4/4/134487216/jokax.pdfIn PDF document text
    • https://gizajosusu.weebly.com/uploads/1/3/1/8/131856374/wopakegiduboroxukata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_605500c97a00e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497082/normal_5fe5fa685cae3.pdfIn PDF document text
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/9388408.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_5fe8732e2804c.pdfIn PDF document text
    • https://beponelife.weebly.com/uploads/1/3/1/1/131164358/d03afc5f2058d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6028be131de61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujiserefi.pbworks.com/f/how_to_write_a_quantitative_data_analysis_report.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144524280/piano_notes_for_simple_songs.pdfIn PDF document text
    • http://vonodatob.pbworks.com/w/file/fetch/144717747/39105274528.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/how_to_get_my_w2_from_former_employer_online.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470760/what_are_the_most_valuable_madame_alexander_dolls.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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 5736 bytes
SHA-256: ee782920f8109b540fefe7d80034e2729d1d4c7d07a61cc02cc679bd53b9b29b
font_01_sfnt_off00011835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11835 11404 bytes
SHA-256: 3eea6d8ee8eccd5b7b0b8572d86e0c46f8bab18ae5056fa1c00c5928fa6b3f21