Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e33fd4f0521674…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 18:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 819d47106cdb2f708eede608824f9b93 SHA-1: 989aeed8f49a906ef708573a6d9d8b5a743698d6 SHA-256: 97e33fd4f052167471885a16f1e1af53a8f53c8891d508ed724828464a808764
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 0.9997

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/aws?utm_term=ferrari+testarossa+price+history PDF link annotation
    • https://cdn.sqhk.co/vawapisoxe/wtGdIia/42455408248.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/xezanilukegajutogenu.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/b3miaif/tiktok_real_time_followers_kunno.pdfIn PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/kibogoguz-zanuruvofu-xetogagojaze.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/what_does_dbt_therapy_stand_for.pdfIn PDF document text
    • http://nakozek.mypressonline.com/m.sc_computer_science_books_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/noxomosanena/ijhhtYV/27054069224.pdfIn PDF document text
    • https://nofixemi.weebly.com/uploads/1/3/6/0/136082439/molenefopili-gozoninu-virinojezij-febod.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/durovubegitunapuw.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/d5ynl63/free_audio_enhancer_software_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/takabalal/jjcrTji/puvagezoso.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/gjgjVdP/club_dream_league_soccer_2018.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/the_witcher_book_1_paperback.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/wovitiku/pexejezivotetarobaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/tanarike.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/house_flipper_wiki_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6cc535-bc1e-4444-bf84-2262e4483840/trx_workout_routine_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bebadce-34d0-4310-a6de-0b4aee00cef7/percy_jackson_the_lightning_thief_film_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185ffd53-06f9-4bd0-b33a-9ac57269c116/11425965362.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/13637775346.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/dc_training_programs_for_free.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5044 bytes
SHA-256: e1f80e9f6cc50d012d1c357f9a8f0c2596ff25071cd56131c300e9c4eb4631a3
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10552 bytes
SHA-256: ecd2a3c45b14bc43f82fe59ba41c326c69d15df9326d96598e9eebd6858e0830