Malicious PDF — malware analysis report

Static analysis result for SHA-256 7376ecf822ed83bf…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 21:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e6a62c75e9d57dcfe512f1fa52cce3cf SHA-1: 562441c713b390f9e712369bca241aa4a5af2609 SHA-256: 7376ecf822ed83bfc48223b98355d91c5d5f0e2917f63ca7b01854ecea257314
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 0.9993

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://seumenha.ru/award?keyword=luteranismo+calvinismo+y+anglicanismo+pdf PDF link annotation
    • http://lnstagram-verifedbadge.com/how_to_use_a_keurig_mini_youtube93k2z.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/basic_korean_language_tutorialki9qx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5fdd341f82c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_600b9a955bbae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418981/normal_5ffdc284d6c8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414353/normal_60294b56e06f6.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/2009_cadillac_srx_repair_manualbmyqc.pdfIn PDF document text
    • http://opensalon.xyz/rurogepoluturebakjt0bk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463825/normal_5ff15d00b6a30.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/e3354f6a-c3c1-4033-9c95-4080172b0b40/vodetimejebusawazasibis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cdd175-79d0-4f83-81eb-e87ca8f6ac2f/westinghouse_outlet_timer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/30862967417.pdfIn PDF document text
    • http://kuwixogup.rf.gd/65_bpsc_question_paper_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf7dcf1-64ac-4e7f-b149-c48cc70fab72/feng_shui_flying_stars_2020_july.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/cf_auto_root_apk_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/75299866550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83981df0-fa39-4bdc-923b-f4eb6cd73338/kijamexalavaxavuko.pdfIn PDF document text
    • http://mujujum.epizy.com/un_decametro_cuadrado_cuantos_metros_cuadrados_tiene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaff53cf-1fa1-43a9-ba9a-e0398ec0751a/81960804057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ff5f81-11f5-476e-9a50-4a1165d36a13/30481967930.pdfIn PDF document text
    • http://jubusuboluxegab.epizy.com/nepal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62fd3a74-f3c0-45f4-a1d5-b95a21acb278/tejajatenuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819e6820-bfa8-43e3-9780-699bf5486bc6/medaxibuvexige.pdfIn PDF document text
    • http://xedaxabefax.rf.gd/math_worksheets_for_1st_grade_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed51b114-fa2c-451d-bf28-64f61e04452a/ford_e350_service_manual.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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 5580 bytes
SHA-256: c3fa54a70782b6ec764ecfbfc2efabe311e4b7df0ade08ff479021fc3bffe52a
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 11096 bytes
SHA-256: 68ee3167bdfb31db6ba8f955450e1689831dcc9dddd62f39f4192b11f66e5e1f