Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b63f273bb97e864…

MALICIOUS

PDF

108.2 KB Created: 2021-03-04 21:20:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 025890ee69a24d23be96201ce6903925 SHA-1: 98352ad33a2aeca20b165c444b6646641858b289 SHA-256: 0b63f273bb97e86444c760fc2692812ec5669f87363aa9e68874cef8961d0e0a
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://leonvi.ru/123?utm_term=what+is+socratic+irony+and+how+does+it+function+in+the+euthyphro PDF link annotation
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/pirozatov-kizokolukedemud.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/ghQ5eih/expedition_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/hcsieDN/pifuxuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/gcBFifc/snowflake_stocking_holder.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/ed012c6e8.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/bigariter_zumod_lekobaduju_kabek.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/47585253722.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/DlKpigc/ravoranilite.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/wotogux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/what_is_the_great_awakening_summary.pdfIn PDF document text
    • http://zegigofupiva.rf.gd/4203633427.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_2169e7b4f90d412d8fcfb43e3019c463.pdf?index=trueIn PDF document text
    • https://e8aefce9-c956-49fd-b8a9-ca98f9eba8d0.filesusr.com/ugd/bcd086_5204e80973b84d678ad734510a1080bc.pdf?index=trueIn PDF document text
    • http://kifarir.rf.gd/alter_ego_plus_a1_cd_audio.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/what_is_the_purpose_of_an_estoppel.pdfIn PDF document text
    • https://f55c6975-0091-4942-a106-dc80285e5f9d.filesusr.com/ugd/8a4248_6cd767a04205499ca6da84776d729955.pdf?index=trueIn PDF document text
    • http://magomodatibotu.epizy.com/82585145006.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_621575d9bb6c4e61bc1c8b1b428b4d25.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_b4c281387e194d969b47819b3e38138b.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_844a694d246d4280a570cf315b1f700f.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_off000169d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D1 5420 bytes
SHA-256: f56c1c96c343a7c437a5145a9f05f6033b929886446297f3f1bee6bf8a7089b6
font_01_sfnt_off00017c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5B 11636 bytes
SHA-256: a5a0fc9e73caee2d72bdefe6ac1c507863952ada0ad9c6df785651566bc0186a