Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858a88f97d8f9a6…

MALICIOUS

PDF

104.4 KB Created: 2021-04-06 08:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a28d6a16ee7e0ccb1b9a7a602ac490c3 SHA-1: 872dc5251992ea2675c4abdcf5dbe2a5f202ed72 SHA-256: e858a88f97d8f9a617f43b3db2163d44abf3d9e4ed85b14740dd9659e397ecfb
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user to malicious sites. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=gardner%2527s+multiple+intelligence+test+pdf In PDF document text
    • https://cdn.sqhk.co/gukixaluril/j5nsB6E/khorne_daemons_battle_report.pdfIn PDF document text
    • http://lasns.fun/fakopasizegokoxamifitoduyyex5.pdfIn PDF document text
    • https://cdn.sqhk.co/gizapakoni/W9gdjcL/dujivuvuwusajodajupusow.pdfIn PDF document text
    • http://save50.pro/shalom_aleichem_sheet_musicx9001.pdfIn PDF document text
    • http://apsmall.space/free_vehicle_checklist_template_excelk7c48.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/1609285.pdfIn PDF document text
    • https://gasibexagitusin.weebly.com/uploads/1/3/1/4/131408117/6163901.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/Lhc4hfn/nhl_games_live_today.pdfIn PDF document text
    • https://cdn.sqhk.co/salipini/3gcFgix/jeepers_creepers_3_movie_dual_audio.pdfIn PDF document text
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/jajew.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/tefasesumifarix_jajugoxeseja_murovupakavute_datizepaz.pdfIn PDF document text
    • http://qqkaxes.xyz/nijisudemozasezibekutoluz53ph0.pdfIn PDF document text
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/vusibusuv.pdfIn PDF document text
    • http://good-production17.site/eraserheads_song_list_freekpc14.pdfIn PDF document text
    • http://alex-chekalev.com/caillou_theme_song_violin_sheet_musico79hg.pdfIn PDF document text
    • https://cdn.sqhk.co/fedukifenufu/Cibi5uT/agent_agreement_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_34e260ebbe5740bc8ca6b0ad2b00961c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gurafoga/riwijaropapaliditidodudi.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/guxiwevetodupegoni.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/ditunaruk.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_00cd03a9593b4ed98716c8403a1392d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tibitexil/beats_audio_installer_apkpure.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_7c7dd551c95c4a6dabf7e32db1b145ab.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_3821e50040a649febc654d78dddbe5c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/54509903734.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_off00015aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEA 5540 bytes
SHA-256: 5f677d5e30a60de8ec30a68b07829c23740b606ee8359e759588acc855ec11c8
font_01_sfnt_off00016dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DBB 11216 bytes
SHA-256: 54d8ecd6a76e8fb5a40e23b5d33cca61e7d0cac9cbf8dcf0987349b878bca3c1

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