Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadfc6bcbf80e24b…

MALICIOUS

PDF

79.9 KB Created: 2021-02-14 03:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2720dc0914539253d6283fc33771caa1 SHA-1: 4b9cf15908f37ed29711ebf985e09a16dd6f78c0 SHA-256: fadfc6bcbf80e24bfd53f5c9041bded4a63b7dc7ed8c5e1f90120ece775eea8e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to link farms hosted on disposable domains. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it as malicious with high confidence. The presence of external URIs and the link farm nature suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=unitedhealthcare+pharmacy+formulary+2020 PDF link annotation
    • http://zexawil.22web.org/zunuxudowexuxixeruseraw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387427/normal_600058bb682c8.pdfIn PDF document text
    • https://cdn.sqhk.co/buvovemif/Tzgfyhb/rubber_bullet_manufacturers_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/derepinejabi/liajiFy/seven_wonders_board_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/bojexisebiwi/jahj1gd/true_skate_unblocked.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5fe081546d247.pdfIn PDF document text
    • http://tubixiwuwura.iblogger.org/wulorasuvokejun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6025cd514570e.pdfIn PDF document text
    • http://faladen.22web.org/dijemeworuzumajogo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401712/normal_5fc5cb5ec1ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f66966b54.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/tazeziwetarad.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/tikububiwidu.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/5Ajj9jh/cara_berhenti_berlangganan_paket_gimmick_dunia_games_telkomsel.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/rabewiruzitewa/fannie_mae_repair_escrow_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/postulate_geometry_worksheet.pdfIn PDF document text
    • http://vogafaxusa.epizy.com/easy_geometry_problems_with_answers.pdfIn PDF document text
    • http://sitikaf.epizy.com/wosaxanurititatatidir.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/barbie_dress_up_games_online.pdfIn PDF document text
    • http://wokoziguroron.rf.gd/high_pressure_die_casting_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/35264617782.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_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 5584 bytes
SHA-256: 567436251e3a3edddd8d623d1909b2242895f595654e44e7c3d2649109c12618
font_01_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 10160 bytes
SHA-256: dc5bd34b026936ee8bc6fe2551dd40b049b6a7cf0ec6a7e7de77597e823826ef

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