Malicious PDF — malware analysis report

Static analysis result for SHA-256 548575fda997148f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-09 17:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5a6c57b39c22ec156b7d6e573a50c293 SHA-1: de25241c463ac6abe9868c3e80433aa0c043f178 SHA-256: 548575fda997148f259adb93bb3395b4dbc04dea6cb7779b982a37f28969f550
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/award?keyword=armature+reaction+of+alternator+pdf PDF link annotation
    • http://winsl.space/bogotixasobupavewelenijuj39guy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449424/normal_5ffd7e39c0ea4.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/4726068.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/87349932682y809t.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/ifhaYjb/bullet_force_mod_menu_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_60245df22a8e0.pdfIn PDF document text
    • http://svoydvalend.xyz/buku_lagu_dan_kunci_gitarjuleu.pdfIn PDF document text
    • http://blancer.xyz/google_slides_templates_simpleb2zck.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/4jfjajj/craigslist_denver_motorcycles_used.pdfIn PDF document text
    • https://didoruzokikad.weebly.com/uploads/1/3/0/7/130739542/sukunekida.pdfIn PDF document text
    • http://dressnbuy.com/proform_adjustable_dumbbells_12._5lb_pairb0tde.pdfIn PDF document text
    • http://tixshopclub.fun/alarma_buster_manualvuvdy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_602c6078c6824.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/webubedogemulutodeno.pdfIn PDF document text
    • http://giocodigital.space/checkers_cheap_menuv6899.pdfIn PDF document text
    • https://zabodoxukuxubar.weebly.com/uploads/1/3/4/9/134904472/c70b5f.pdfIn PDF document text
    • https://padazuvotoj.weebly.com/uploads/1/3/4/6/134687326/larisenovape.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/1aTjjhc/41171060989.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/fundamental_analysis_course_indiaq2gl1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakusineba/pozepul.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/grammar_exercises_for_ielts.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/philips_universal_remote_srp9232d_27_code_list.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/antigen_specificity.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 5112 bytes
SHA-256: 4ab8802acf380dd692520c9f0548f7a236a24648ba23b0cbcff71b33dfd6e01e
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10072 bytes
SHA-256: 2828cee134c01285b0fb5a8f479c43361e261a0002bceaf70c8701d240f67a8d
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 16136 bytes
SHA-256: e062faff0b5f3d12ef96d17a813e209689a07cec8984531399442ab350abe39b