Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb2468d28c70f62…

MALICIOUS

PDF

73.2 KB Created: 2021-03-24 01:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 129bd6bd65af12a43ee1b8dc6f3ce42a SHA-1: d8824b401bc622ebfd79d62c1e0a66e085460459 SHA-256: 8bb2468d28c70f62d4750dd3411e8b2c50a592417ccf40c25c817bee72fc1b5b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or a method to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to distribute malicious content or phish users by directing them to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=binomial+models+in+finance+pdf
    • https://cdn.sqhk.co/badaxiloru/WVLejds/potaliledanasoz.pdf
    • http://eroganoficial.site/matlab_fft_ifftstljk.pdf
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/368051.pdf
    • https://cdn.sqhk.co/gepumenujeme/ekiGG28/motogp_crashes_2019.pdf
    • https://cdn.sqhk.co/vilosezuj/jbtidp0/ruvoxiwobikaxofozexut.pdf
    • http://esclub.pro/south_africa_visa_application_form_dha-_846n0cq.pdf
    • http://100naturals.fun/gojuwererakezexuxifeduo3i1e.pdf
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/gutoxibak.pdf
    • http://tibetterrier.ru/jivinezopesoozdm.pdf
    • https://cdn.sqhk.co/jogeguzotire/xwhijc5/wire_rope_cutting_tool.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fda6799d-a943-4dcc-828a-e108adcc306c/54891835420.pdf
    • https://s3.amazonaws.com/tokatefozude/bizalixixumi.pdf
    • https://s3.amazonaws.com/mixanaz/50032386550.pdf
    • https://s3.amazonaws.com/rimepusox/rawojiwulagivupifatumosok.pdf
    • https://s3.amazonaws.com/daselex/rebulusovofa.pdf
    • https://uploads.strikinglycdn.com/files/b64f0a11-1bbf-4924-9dc7-09fbba60817f/juego_de_tabla_periodica_interactiva_aprender_jugando.pdf
    • https://s3.amazonaws.com/vonusirukete/benafagojuvonexex.pdf
    • https://uploads.strikinglycdn.com/files/c44708ff-d248-43d2-af3e-2b7ff846631e/42284299525.pdf
    • https://uploads.strikinglycdn.com/files/f0e37174-c921-44fc-9b9c-b581e4816edb/unidad_3_leccion_2_reteaching_and_practice_answer_key_page_14.pdf
    • https://s3.amazonaws.com/wezukep/79313595833.pdf
    • https://s3.amazonaws.com/gudukupir/constitution_test_study_guide_8th_grade.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dead.bin
470dcf7a48837fae72bc6b7520aa81608160462b33af739702bc665b306de7a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 5256 bytes
font_01_sfnt_off0000f082.bin
1d8f891a467f92f47045722de0c563f1b3d1d8edfbebdf5b66e4f28180656f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 11492 bytes

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