Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146d6f987941b4c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 10:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f423803963c3ac9c31014be696edabab SHA-1: f1dc5fc074b8121dce66530c24af56fa9bd81f32 SHA-256: 4146d6f987941b4c0e1493825b78ab678a755ab72c5db1eb9090ea9ac74a7cb7
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding a large number of external links to other PDF documents. The primary heuristic indicates a mass of external PDF links, suggesting a malicious intent to manipulate search engine results or host a large collection of potentially malicious files. While no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=mathematical+physics+pdf+for+bsc+1st+year
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/3264285.pdf
    • https://fifofisepag.weebly.com/uploads/1/3/5/9/135985139/832fda22ad.pdf
    • https://cdn.sqhk.co/penavagalo/oSUvBfR/fabomedojutazewavoxozevu.pdf
    • https://nadepopuzoli.weebly.com/uploads/1/3/4/6/134611029/56ae5d169d8.pdf
    • https://cdn.sqhk.co/wigalefu/jagjyJL/cara_bermain_multiplayer_di_city_racing_3d.pdf
    • https://cdn.sqhk.co/takivelalam/jiihWSt/o_que__retilneo_e_uniforme.pdf
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/5879549.pdf
    • http://helplnstagramoffice.com/jazz_2nd_edition_scott_deveaux37lpe.pdf
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/mimowoxu.pdf
    • https://cdn.sqhk.co/kawurefeki/O7EfJjf/ninja_smoothie_blender_amazon.pdf
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/seloki-surovovarapek-tufasaxufizomel-jesokiroliso.pdf
    • https://cdn.sqhk.co/biziduwime/B8Cifjg/pool_billiards_game_for_android.pdf
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • http://exampl1214.com/jisowerufulilubloaic.pdf
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/fixebidotute.pdf
    • https://cdn.sqhk.co/lizoxazafofe/MloCSia/59541531792.pdf
    • https://cdn.sqhk.co/ramawuvade/jhjn1gi/xexikanitisokuma.pdf
    • https://cdn.sqhk.co/tirabipati/aidjbje/diy_mask_holder_chains.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee1e.bin
ffc0d86bd58d11ed9dd3c14b5dbc7be801a7db62eb8f6064bc27eb96b48a65e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5692 bytes
font_01_sfnt_off00010163.bin
fc3b813b3af33318e4ccd9c5971f637595936c322f5f282a0dd6836b787df981		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 10988 bytes

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