Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5b532148ccba2e…

MALICIOUS

PDF

74.8 KB Created: 2021-05-16 21:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a16b74de09393fc92a6e34192d8012ae SHA-1: 7bacf5bf866972459d1ce46f6ee72104a5fd5391 SHA-256: 3c5b532148ccba2e9078dd38d21816c673025349e1268c8beeb01109fe62c6d1
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 identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one pointing to 'zajinet.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to reference a network device manual, likely a lure to encourage clicks on the embedded links.

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://zajinet.ru/strik?utm_term=tp-link+tl-pa2010kit+manual PDF link annotation
    • https://cdn.sqhk.co/purovufizu/jlOhgLQ/xelaxudosudaru.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/f4NQBv9/brain_stress_balls_with_logo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_6044ad81b8513.pdfIn PDF document text
    • http://gazzsheff.xyz/the_amityville_horror_1979_moviectydo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_602a6ebbb2d53.pdfIn PDF document text
    • http://mofopafilubo.22web.org/53464189144.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482206/normal_605e02255d33f.pdfIn PDF document text
    • http://raifaisentapp.online/38236328603hekbr.pdfIn PDF document text
    • http://drilltech.info/how_to_make_your_clothes_glow_on_royale_highfwn4t.pdfIn PDF document text
    • http://rupuvuk.22web.org/acca_p4_summary_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_601faaf4d4447.pdfIn PDF document text
    • http://verification-help.com/west_buckland_school_uniform_shopo9drp.pdfIn PDF document text
    • http://olx-delivery.cc/24653166809j6qnd.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/AjjbBmx/bmcc_nursing_program_reviews.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/kovezux/desubokumifaduxewotiw.pdfIn PDF document text
    • http://gisatazab.rf.gd/up_board_maths_books_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/what_are_the_mean_median_mode_and_range.pdfIn PDF document text
    • http://vefovax.rf.gd/11839269568.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/kifutirodogosexosukazivu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 2996 bytes
SHA-256: c754879f35cf667d5c5b0449bf7b7884ad17765573ae5fcd8bfe39c540121b62
font_01_sfnt_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 5060 bytes
SHA-256: 23eedae2f397e8eb5abf08f25a35fa3df54debfbfa874018a564d05c13bc316d
font_02_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10732 bytes
SHA-256: d61e9f62903dffe03a4746d87e935ebdb9cc1065f0d9595bb36c3ac16cbd6f16

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