Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1397ca75b354df…

MALICIOUS

PDF

79.3 KB Created: 2021-03-21 09:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 068596d0d163c685515a4eaa64fb5dd1 SHA-1: be31927724bc74f1b9d411bb861a502306571954 SHA-256: 2c1397ca75b354dfb815616b92ebfb5ac0132a69824a33caafe8f03a8335c95b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The embedded URLs, particularly 'https://nipisod.ru/wix?keyword=adding+and+subtracting+integers+coloring+worksheet+pdf', suggest a phishing or malicious content delivery attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a worksheet, to trick users into clicking embedded links.

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://nipisod.ru/wix?keyword=adding+and+subtracting+integers+coloring+worksheet+pdf PDF link annotation
    • http://lawalek.iblogger.org/deltarune_lancer_sprite_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375353/normal_604738146230d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_601a6f649322c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_60033fc3a09ee.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/hotpoint_gas_range_oven_igniter.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/they_poured_fire_on_us_from_the_sky_the_blade_is_blunt_summary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazuvit.rf.gd/equifax_credit_report_dispute_form.pdfIn PDF document text
    • http://fomigidaxek.epizy.com/online_malayalam_books_free_download.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/nixifi.pdfIn PDF document text
    • http://mikijanux.atwebpages.com/beirut_restaurant_menu.pdfIn PDF document text
    • http://wuguwusilabibax.epizy.com/edge_of_the_empire_core_rulebook_anyflip.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/xomeku.pdfIn PDF document text
    • http://baxadozivu.epizy.com/heart_bypass_surgery_video.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/61559187190.pdfIn PDF document text
    • http://palibam.atwebpages.com/zowopasemukit.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/technical_interview_evaluation_sheet.pdfIn PDF document text
    • http://xejidomu.rf.gd/dnd_5e_spell_slots_multiclass.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_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 5700 bytes
SHA-256: 68b383283267254fa0043168f12d71d3ef383e1bfb009c82f808216202b3f94e
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11436 bytes
SHA-256: 28fbf332510f691db68d6ba7ac3cb2bf841270c5c94a01f302946332aa4dfa6b

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