Malicious PDF — malware analysis report

Static analysis result for SHA-256 df98955628a82488…

MALICIOUS

PDF

85.7 KB Created: 2021-03-14 15:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b274bc50d4b36ac9252edda4ef4748ae SHA-1: b02d06df7d416439b762b76366fac419ae5f41ac SHA-256: df98955628a824881bcdc5cc5db1e5584cac66e0881123ce3da5b74ae2c47b8c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=compliance+report+format+in+excel PDF link annotation
    • https://cdn.sqhk.co/bogulevim/ibjg2if/swamp_defense_2_hack.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/973290e145dab9.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/28397104376.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinirumawe/nx40a9H/bluehost_email_outlook_android.pdfIn PDF document text
    • https://cdn.sqhk.co/kidimezamos/GidsjbU/ball_hero_adventure_red_bouncy_ball_3.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/cjclYgL/72239600324.pdfIn PDF document text
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/5591975.pdfIn PDF document text
    • https://cdn.sqhk.co/zoribakim/6WHjgWs/zoruxoforujomujore.pdfIn PDF document text
    • https://cdn.sqhk.co/mujutuzidip/wVTjhhc/btwin_500_wireless_cyclometer_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/blghboi/light_it_up_like_dynamite_calvin_sparks_youtube.pdfIn PDF document text
    • https://rinavupitaf.weebly.com/uploads/1/3/1/1/131164375/6b171.pdfIn PDF document text
    • http://zajilakofudo.scienceontheweb.net/virobadowifuseze.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/cetoacidosis_diabtica_2020.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxukekamusun.onlinewebshop.net/20668495242.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/zunudokulezaxolajilomovid.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/the_merchant_of_venice_summary_act_1_and_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/94247903484.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/land_records_intake_sheet_maryland.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/diario_en_motocicleta_pelicula_completa_en_espaol_latino.pdfIn PDF document text
    • http://desigaweru.myartsonline.com/zapafitovefun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 1572 bytes
SHA-256: 452612010bf92904adaef4bfd0d246ec5f24367bf67eb47c7737d6475a0c45d1
font_01_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 4956 bytes
SHA-256: 21f573be929817494e169e4a65c5bdd069243b9b44e712d8835065a17ee75940
font_02_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 11096 bytes
SHA-256: 72d3e3936e025f2840d31a892caec4f0c22a399590d97a1c909d1c7f1a9ee7ce
font_03_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501