Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b20805e894a3446…

MALICIOUS

PDF

82.4 KB Created: 2021-05-10 06:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f1dd2b816c421a95c0ea019f5f264fb6 SHA-1: 9d1a13471fdf51950cbcd74855fe36123d49c2a1 SHA-256: 3b20805e894a34467d2cad045e1ab3fd9a54cee236d6b515fbb05b1db627b94b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve as a landing page for further malicious content. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=refinishing+kitchen+cabinets+cost PDF link annotation
    • http://indital.fun/best_animal_movement_exerciseskz1y6.pdfIn PDF document text
    • http://verenica.net/amway_products_catalogue_2017q2pnp.pdfIn PDF document text
    • http://xbet1.fun/toeic_practice_test_2020glhlz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_6020866059d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496607/normal_604b8b3a7f166.pdfIn PDF document text
    • http://ideal-it.fun/bodemuzimu70j1t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_604f8de32679d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_606cd8e0bf6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_6036cbc030940.pdfIn PDF document text
    • http://reetodo.online/dokobizajadujebemo6342m.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/warapagefasovi/rumble_fish_movie.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_091736b2f49a48f9a07c4172e8ab29df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/great_ampong_adaka.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_3d73f3bbcb504f55b6291d074720e1f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jebokizez/zidet.pdfIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_e7890e39b4204111a4a21fdae199d299.pdf?index=trueIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_fc5016c00d4c43ceb4d78766f6e3c288.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvosi/posimitogijapuzefobijoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/ksb_pumps_india_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/ford_focus_rs_2003_for_sale.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_0415cec0a24349c59cfa761e3a606a4c.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_e1d440aee59f497d8fdc5925fce122f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/74245638939.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_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 5228 bytes
SHA-256: 96dcf0c1fcb1091141fb0b7fcc1e66c26534f36d6890cf0b90ee5e35597a6abe
font_01_sfnt_off0001158f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158F 11428 bytes
SHA-256: 41f59010e6d1f24af4521a05189a97c73fb787c552d3c67693e65d141e351757

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