Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d743cc73c4e2c0…

MALICIOUS

PDF

76.6 KB Created: 2021-03-28 16:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 403e807eb08ba68fa207e00759bc774a SHA-1: 98dc5e5eafc1efb6bf85fb5ca04cac4ce2c3e831 SHA-256: a7d743cc73c4e2c05468af092abf513948cc15a7329a0583830d2853616e3401
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://soxebez.ru/strik?utm_term=how+to+use+refine+edge+in+photoshop+cc+2015 PDF link annotation
    • http://biomanix.best/city_fighter_vs_street_gang_mod800cl.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/8ifhhhb/how_to_make_heart_bookmark_out_of_paper.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://bogplaktnc.fun/what_time_does_black_friday_start_at_walmartvl97s.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/15167625943.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/korg_sv-1_73-key_stage_vintage_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/iDEjgjf/real_chess_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/yicUihI/11323781588.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/hbG8Shj/can_vlc_for_android_cast_to_tv.pdfIn PDF document text
    • http://afracheat8.xyz/facsimile_cover_page_template58k5q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_5fe7cdece33e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_602baf5ee30ec.pdfIn PDF document text
    • https://cdn.sqhk.co/wotinobeb/blEbjiJ/tuxetenokimomejaperusab.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/503ec7a2-da70-43df-9a9e-5aa067c77da3/kanusinamunikilevitad.pdfIn PDF document text
    • http://bigofuzov.epizy.com/riwidaniwavutosutirak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc8829c-9d7e-42cb-914f-049ad36cbd11/16763955176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27340ba6-ac13-432a-afe8-b8f3acddb8bb/37510983338.pdfIn PDF document text
    • http://mekasesajiw.onlinewebshop.net/72635940545.pdfIn PDF document text
    • http://nawonarubital.epizy.com/dazifokemurazoxe.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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 5676 bytes
SHA-256: ac236e17e240ae8b2f6493541495f9e200cf2fce986621663c2a6295753dd2dd
font_01_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 10884 bytes
SHA-256: 63eb5b6804241ca0bcda50d2d2aa56c669b2068677db6b7d7c726af586d6793f