Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e39d8d2daa03e9…

MALICIOUS

PDF

85.9 KB Created: 2021-04-09 18:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 700f64c3a7571c3f5f1d04b66e507243 SHA-1: 5e15231a994762d83b671721c82efe81491b27fc SHA-256: 40e39d8d2daa03e916ce93ea83273cf38a7948385813e78d126550f901b25763
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to `resalured.ru`, suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains keywords related to fixing gas lighters, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=how+to+fix+a+gas+lighter+that+won%2527t+spark PDF link annotation
    • http://vobalemujumojak.mywebcommunity.org/nagikij.pdfIn PDF document text
    • http://i-men.ru/79674919503urw4a.pdfIn PDF document text
    • http://hdsamara.ru/tuxofakorabufumovufeporokzgd7.pdfIn PDF document text
    • http://chambreapp.xyz/how_to_measure_phonological_awarenesspae5u.pdfIn PDF document text
    • https://gemuxobupi.weebly.com/uploads/1/3/2/6/132682013/bdb36c.pdfIn PDF document text
    • http://levelupguild.com/trai_h_si_tnh_c_v_b_trnqb7j8.pdfIn PDF document text
    • http://fakaripeti.xyz/boxirefifufomofuxazhovlc.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/dimilumadajavotivuxi.pdfIn PDF document text
    • https://befukifesili.weebly.com/uploads/1/3/1/4/131453358/3011492.pdfIn PDF document text
    • http://899themes-demo.ru/craftsman_garage_door_opener_repair_near_me8thdw.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/9458570.pdfIn PDF document text
    • http://student-yurist.ru/oscar_et_la_dame_rose_movie_summary9fke8.pdfIn PDF document text
    • http://jarisudowapebi.sportsontheweb.net/kindergarten_math_worksheets_free_download.pdfIn PDF document text
    • http://volosaty100.xyz/desde_el_jardin_de_freudl6hzl.pdfIn PDF document text
    • http://sellforce.ru/85218309142iiamv.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/779044.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/e68eb729-988e-49a9-9831-6558c94bdc24/rite_of_spring_bassoon_solo.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/ars_poetica_neruda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f400298-1616-49ce-89f1-c1ca2d2ba73b/12872398239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842f8a73-e547-4af3-8132-2614a4e5aeeb/how_to_measure_for_replacement_chainsaw_blade.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/zuxidexokodomizedume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1b5fc30-3f82-4cae-8521-b2ff8c4cc9d2/luzerogajasanobexigavok.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/convert_to_word_ocr_thai.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.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_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 5384 bytes
SHA-256: 6ea289af4aa915740ef65bffae9199020a9057791edab7ba6a1d94ed959074f6
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 11524 bytes
SHA-256: c79b88830b60e1c9d6551d50cb44cff56de295da663150d507f554d1af21c70a
font_02_sfnt_off00013081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13081 16756 bytes
SHA-256: eacce040cd7ddbe5bd638eb0b7e4c358aca07d696b0c16e8f14a8bff2cecbd8b