Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f846787a2f34d8…

MALICIOUS

PDF

72.5 KB Created: 2021-02-19 21:18:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1cea84b5fb18298efc9e51c4c2c9d62d SHA-1: 1718ed2c7ee6dad81b73ada1b8ba37dddd0efe47 SHA-256: c5f846787a2f34d8e422e5ad4357b3ac282586e49bcff3d95b4db5d0c697ba15
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 0.9998

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://jottigo.ru/wix?keyword=100+ng%25C3%25A0y+y%25C3%25AAu+em+phim PDF link annotation
    • https://zetejuxir.weebly.com/uploads/1/3/4/3/134338478/2008784.pdfIn PDF document text
    • https://gazapaxinu.weebly.com/uploads/1/3/4/4/134475358/8579f9a4e.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/degulujo.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/760538.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/2439479.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/nubemagigemuni.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/5786579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazesej/video_from_instagram_on_pc.pdfIn PDF document text
    • http://setuvufijub.epizy.com/letter_of_resignation_template_free.pdfIn PDF document text
    • http://zatorir.epizy.com/10933984671.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/87359839108.pdfIn PDF document text
    • http://fanififogijer.epizy.com/android_studio_ubuntu_18.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/miroxemupew.pdfIn PDF document text
    • http://bezepegu.epizy.com/phonics_for_kindergarten_grade_k.pdfIn PDF document text
    • http://nulesuli.epizy.com/bolt_and_nut_autocad_drawing_free.pdfIn PDF document text
    • http://zozusanom.epizy.com/coordinate_plane_distances_worksheet_answers.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_off0000de48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE48 5304 bytes
SHA-256: d8bbeba08f162926a2118f29e4a14510697fac1777f40186aa6bc0ef88f1b51b
font_01_sfnt_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 10808 bytes
SHA-256: 8e34e507ee9506d9650cb3be182b06881205955f27d45bca874bcc534c149344