Malicious PDF — malware analysis report

Static analysis result for SHA-256 c342a4e1ea8dbfdf…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 04:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0ba228543aae21ea28ffc2d501a6d047 SHA-1: 54d89946249bb9d6a09f5275e318f103c7e6bd16 SHA-256: c342a4e1ea8dbfdfb925865571ff64532d323eec2fc4186ad4caa115c44b2731
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that lead to link farms and potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. The primary malicious URL identified is 'https://resalured.ru/wix?keyword=find+infinite+sum+calculator', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to calculators or academic resources, aligning with common phishing tactics.

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://resalured.ru/wix?keyword=find+infinite+sum+calculator PDF link annotation
    • http://getyourcredit.info/29338458648xxggs.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/h3L5OBi/plan_electrique_maison_quebec.pdfIn PDF document text
    • http://domainlimax.xyz/e_myth_contractor_audiobookr36mo.pdfIn PDF document text
    • https://cdn.sqhk.co/kegimovotol/7hbPgj6/live_football_tv_streaming_app_for_pc.pdfIn PDF document text
    • https://gadiziwit.weebly.com/uploads/1/3/1/4/131406086/goxifarafavij.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hMhcxgg/zowusuwuj.pdfIn PDF document text
    • http://zdorovienashevse.xyz/4544900352z9yzt.pdfIn PDF document text
    • http://adminhalil.com/nelowoxexevex6o99m.pdfIn PDF document text
    • https://cdn.sqhk.co/fetumamuv/9Yjexh9/18610394064.pdfIn PDF document text
    • http://discount50.pro/rerifofiloxodidikuyh32h.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/fggjfR4/singing_machine_karaoke_machine_power_cord.pdfIn PDF document text
    • https://vesedosaripiwuj.weebly.com/uploads/1/3/1/6/131636692/8435983.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/vipinib/crayfish_dissection_lab_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc920021-19bd-40d4-a710-d12bd132d69e/rock_jam_speaker_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e03ec2-63fd-4981-acc3-0eec9654ed36/what_is_evicted_in_irish.pdfIn PDF document text
    • http://sujosivetobifir.epizy.com/48500387068.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/bawomekufobisuvubipiwa.pdfIn PDF document text
    • http://japorivexasore.epizy.com/vapegivoresujivizakefoji.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_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 5124 bytes
SHA-256: 65dc27eece1364e6e40b6b4a0fbf3c63f456be83c80a54aea18da507d17666ba
font_01_sfnt_off00010460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10460 11580 bytes
SHA-256: 216f5f2863941355a6489e0731ae1bb99c20b039f193ac899b7459235d67010e

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