Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c561bd1f7135c9f…

MALICIOUS

PDF

79.6 KB Created: 2021-04-06 08:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3c91259a97eb320e90eeb39f6d769feb SHA-1: 737844c1c27ded5a18640b5d0a32ba30d5ab19e3 SHA-256: 7c561bd1f7135c9f048f618e7f091509004176f0d3e366c8c7fd446a3e30478c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as search results for common products. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggests a phishing or malware distribution intent. The primary malicious URL identified is https://resalured.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=philips+universal+remote+input+button+setup PDF link annotation
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/gewek.pdfIn PDF document text
    • https://cdn.sqhk.co/vedisaso/x5hjYhe/country_music_singers_on_walker_texas_ranger.pdfIn PDF document text
    • https://cdn.sqhk.co/xutijexop/fibjegc/63860486275.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiren/ifS0gjd/luxor_cleo_pyramid_king_deluxe_room.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453914/normal_5fc56fd52a251.pdfIn PDF document text
    • https://dumisoxi.weebly.com/uploads/1/3/4/6/134625223/jaxajosegex-tanabijadi-tozaxunivipim.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuvebafo/ggfMmhj/appvalley_for_android_free.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/aFRDjjN/49444685053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_604e1a0076429.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/8b3faef9-d086-4178-b746-c9072f593042/pajabipebasir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d4f886-f23c-4a1f-8951-820e6d8fe8c4/final_fantasy_7_remake_xbox_one_gamestop.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/lamborghini_lyrics_doorbeen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a781fc64-45e2-40a3-929c-ddb2b553dc11/the_little_match_girl_picture_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/remebosopegef.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/homedics_cool_mist_ultrasonic_top-fill_humidifier_with_aromatherapy_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d69eadd-9c9a-4847-9e64-9a0879d70e89/adobe_premiere_elements_freeze_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bambini_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/48258246751.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/88048972738.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/adobe_reader_apk_windows_xp.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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 5260 bytes
SHA-256: e13275038e8b9ceebd7a85ca1ae8e1fc8f89f4575acc5519aa1865e72cf48ba1
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 11100 bytes
SHA-256: da4411199ffba6060532a4fe222b120cbe3487ea9bbe6bfd261761cd4baa7914

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