Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02fdf38acb94814…

MALICIOUS

PDF

85.6 KB Created: 2021-03-19 08:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf230c994c2b1c809287e531f2aaf8f5 SHA-1: 6adcf210b1814f58fac83e9d902e7aa8e66fe357 SHA-256: b02fdf38acb94814a214f5b531ee6199f7ce050b1ac940ca7831e0ac317e559f
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', hinting at its generation method rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=npcscan+overlay+2020
    • http://zegoves.22web.org/rca_32_inch_tv_wont_turn_on.pdf
    • http://deliwubavamir.mypressonline.com/proofs_involving_similar_triangles_worksheet_answer_key.pdf
    • http://dewisazovuvoxi.mywebcommunity.org/black_and_decker_power_miter_saw_1701_type_1.pdf
    • http://lojuxaga.mywebcommunity.org/newomijalelaw.pdf
    • https://cdn.sqhk.co/nunemiziku/YQvwqFy/bisegakasibabexutupo.pdf
    • http://kerutugizuxig.mygamesonline.org/weketo.pdf
    • https://cdn.sqhk.co/mudifuto/acljdPC/groove_life_ring_coupon.pdf
    • https://cdn.sqhk.co/lifupowaseli/eJigDjg/gusejor.pdf
    • http://pumaguli.scienceontheweb.net/xaxojubetazes.pdf
    • http://sevowina.medianewsonline.com/how_to_draw_a_realistic_tree_step_by_step_easy.pdf
    • http://sazaleve.22web.org/akaike_information_criteria_example.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xazimipifigak.rf.gd/binomial_theorem_expansion_problems.pdf
    • http://vogojitipam.epizy.com/kiruvevigobukewobepufit.pdf
    • http://xuwabofori.epizy.com/retepofebi.pdf
    • http://rugoxesoteko.myartsonline.com/sizixibakom.pdf
    • http://gipafame.epizy.com/ca_568_return_instructions_2019.pdf
    • https://uploads.strikinglycdn.com/files/affd86df-341b-409b-8246-5e681c02f962/20076924623.pdf
    • http://katufimeg.rf.gd/machine_learning_and_ai_training_in_bangalore.pdf
    • http://dokubuxopid.rf.gd/mesofuti.pdf
    • https://uploads.strikinglycdn.com/files/c4388298-3380-4983-b076-49873ec55cd7/bemisinaxojijejadexa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ef.bin
5ea159f3d81b49bbb4b30601cab494219cf39b51007e3de7edd3d3cd5fb25de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 5332 bytes
font_01_sfnt_off0000f82d.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 1800 bytes
font_02_sfnt_off000100bb.bin
3011205d2ae0f77704b81abac2138b3207aa5ac0f8892fbd29fb3e3f11d9bd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 15652 bytes
font_03_sfnt_off0001314a.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 16312 bytes

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