Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1531a6f1e3720c2…

MALICIOUS

PDF

83.1 KB Created: 2021-04-05 14:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 303f923d1f950c409edf36fc3929e91b SHA-1: cc83edc88a0d9f5e913dc6c4a2e1e0ada6c5044e SHA-256: d1531a6f1e3720c29f11beca9d77696d1193586220e9e6c012b35ae05da77811
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document body, though heavily obfuscated, contains references to 'Lg 440g phone specs', suggesting a lure to attract clicks. The presence of numerous external URIs, including one pointing to 'resalured.ru', indicates a phishing or ad fraud attempt.

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://resalured.ru/strik?utm_term=lg+440g+phone+specs PDF link annotation
    • https://cdn.sqhk.co/nuduniguwufo/iJifUih/multichoice_diski_challenge_results_2019_20.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/bjji7hc/ion_blade_trimmer.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/hehcSCg/skull_art_wallpaper_iphone_6.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/WwThebA/racing_car_3d_wallpaper_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/jfRgerg/9678476736.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/hejiggF/fisujerusafa.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezagivori/4acWhbt/f150_dash_light_color_change.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/qjiTijR/easy_way_to_top_up_in_free_fire.pdfIn PDF document text
    • https://cdn.sqhk.co/ziriziwebu/ia06yAW/voice_input_android_keyboard.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/biblia_reina_valera_download.pdfIn PDF document text
    • http://vir-tus.com/ielts_reading_test_2_book_9_answers325yf.pdfIn PDF document text
    • http://mkr-olimp.info/what_is_the_easiest_to_understand_bible56icy.pdfIn PDF document text
    • http://job-finder.space/95593389261xvvp0.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/6Lseqja/world_of_kings_best_classes_2020.pdfIn PDF document text
    • http://smm-target.ru/33180593726a6z61.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/rekiluderipewamusobi.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/Bjdjiib/barivefuzulovaj.pdfIn PDF document text
    • http://vowewudimo.mypressonline.com/murray_42_inch_lawn_mower_blades.pdfIn PDF document text
    • https://cdn.sqhk.co/sugutomipu/ciagiDJ/arditex_na_safety_data_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_ebabc485964348d0b3b61ad0c2abbbb7.pdf?index=trueIn PDF document text
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_fb57dae2a4234c3b840b03a8a30deaa9.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_c592d8f3d9f8431aa3d64a88ca353a31.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_b09717858f0344aca75b6b310a6e1efa.pdf?index=trueIn 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_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 5028 bytes
SHA-256: 10dfcd4eb223a9408320bf0d47f9bab2aa64c2b44ddc60dcb926a7b0db9e9122
font_01_sfnt_off000117b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B8 11164 bytes
SHA-256: 689aabf526d71969640cd9b3992c7d2214b9c531640aa3eeef0969148aec9ad4