Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ee67fef84b3d6…

MALICIOUS

PDF

138.4 KB Created: 2021-03-27 22:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8a32a823c3e687f71623232b80d2ac5e SHA-1: 9dafa5e81df8fa9826f6afdcd5aeef72cfe9fc67 SHA-256: 358ee67fef84b3d639ab7cd5e827127c26180d84e550a706441f86263a25372e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. While no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://midufefew.ru/123?utm_term=allen+bradley+powerflex+40+vfd+manual+pdf PDF link annotation
    • http://waferaboteb.mypressonline.com/what_is_an_example_of_scientific_literacy.pdfIn PDF document text
    • https://rovorakule.weebly.com/uploads/1/3/4/7/134774255/8e1eefcde38.pdfIn PDF document text
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/5340112.pdfIn PDF document text
    • https://cdn.sqhk.co/gokarunedod/QbvhfEL/hobby_lobby_store_manager_name.pdfIn PDF document text
    • https://cdn.sqhk.co/muwazubivotu/fcigcia/movistar_colombia_internet_cambiar_clave_wifi.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/xirewulotinosuxesopipudip.pdfIn PDF document text
    • https://wevabubuked.weebly.com/uploads/1/3/4/5/134584052/6965101.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/6cbdde7925669ed.pdfIn PDF document text
    • https://parimuxuroz.weebly.com/uploads/1/3/2/6/132682994/78ea398ba4d069d.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/nIKkFih/mini_retro_arcade_machine_game_list.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/ghagePG/lowes_whirlpool_refrigerators_top_freezer.pdfIn PDF document text
    • https://pupifino.weebly.com/uploads/1/3/0/7/130776741/2d32abef198fe7.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/tusakibolaj.pdfIn PDF document text
    • https://miperodijazef.weebly.com/uploads/1/3/4/3/134308013/xapofidupumipoxix.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/zobagovijikuzap.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/vjcjjGd/free_project_manager_resume_template_microsoft_word.pdfIn PDF document text
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/legebez-zizosewapoza-kolubezilajubob-tasesupur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c903305-6d5d-43e5-b3b9-7db87efa4170/7698386820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9590a87-fa82-46f6-a9a9-30ab87224d8c/64763652332.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C308 5692 bytes
SHA-256: 429c31015db47ccd0a94515ec0b58b8cff41dd1eeb35b1851004324ad53f4a7e
font_01_sfnt_off0001d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D677 12628 bytes
SHA-256: 617c4eece41840e3c4591e33260f59a321299acc81760cb23d734818b9ef3484
font_02_sfnt_off000201ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201AE 18048 bytes
SHA-256: c6950d99e78c6bd622555a7ccbab5df27a48d2c8c8005431dcdfd7860bf8f3ea