Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2773b159c5a1270…

MALICIOUS

PDF

84.1 KB Created: 2021-04-30 15:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: df8a3d955f42d8e5de30032a50b612b8 SHA-1: 5d427b38ef9e7fda77b2157395928eecf8eb277c SHA-256: b2773b159c5a1270c35c76a9ef80252b86d7d045b74e92cc2a0901e0fe2bc17c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('botokaw.ru') and another using a link farm technique on disposable hosting. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a title that could be used as a lure. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=forensic+nursing+scope+and+standards+of+practice+pdf PDF link annotation
    • https://cdn.sqhk.co/gidulikegel/gjGGght/destruction_of_property_this_is_the_police_game.pdfIn PDF document text
    • http://kapusta.pro/697486984881ctg7.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/watagizu-sonikuvega.pdfIn PDF document text
    • http://optamorem.com/146586416370us6o.pdfIn PDF document text
    • http://i-men.ru/what_age_is_war_horse_play_suitable_fortox5q.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/gajgjjw/muslim_day_today_2019.pdfIn PDF document text
    • http://ketrovk.xyz/93358714535f0pvi.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/sopubojusovevoxil.pdfIn PDF document text
    • http://plsale.pro/xabaligquoms.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ieicgfM/lavubuwawen.pdfIn PDF document text
    • http://nadahul.ru/nuwejamalaromafifiligis1edh1.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/Ojavthb/jixumazififoda.pdfIn PDF document text
    • http://cybety.xyz/27250867981xmkju.pdfIn PDF document text
    • http://zoosalon.org/can_i_connect_a_flash_drive_to_my_ipad_pro5n59j.pdfIn PDF document text
    • https://nurinakeviwiket.weebly.com/uploads/1/3/1/4/131407921/jivakusuzuga-xuduw-sepejivez-rajep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodakobenolam.rf.gd/arrive_guidelines_statement.pdfIn PDF document text
    • http://napidolir.rf.gd/love_and_respect_emerson_eggerichs.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/51307819371.pdfIn PDF document text
    • http://dirolowu.rf.gd/ropilobogumedaxudeli.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/kituti.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/subway_surf_hile_indir_cretsiz.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/xonisil.pdfIn PDF document text
    • http://xiramubete.rf.gd/fighter_fish_breeding_malayalam.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_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 5248 bytes
SHA-256: fa061a7c7b08045fcfcda2832649216fdbec2c6fd65d65d0c511dff218e87f8f
font_01_sfnt_off00011c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C62 11104 bytes
SHA-256: 4ffeb4bc2e13c7a94681ff6868aa85d361bcc875be4ca44dd6915cbde05716f8

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