Malicious PDF — malware analysis report

Static analysis result for SHA-256 9195f976550cfb0a…

MALICIOUS

PDF

80.1 KB Created: 2021-03-27 19:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cfe5bf828dec5171cdc0a5713808517 SHA-1: 72f85cf6ab632053d3f482b443b560d5aae0568b SHA-256: 9195f976550cfb0a498b9e2a0cd06a651e34b41ee9907bf11db62ba95e0a9b94
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with the primary one being `https://botokaw.ru/award?keyword=nutricion+parenteral+pdf+pediatria`. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of generated external PDF links, suggesting a coordinated effort to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=nutricion+parenteral+pdf+pediatria
    • https://cdn-cms.f-static.net/uploads/4369327/normal_5fe9fe0030a22.pdf
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/defedudinometo.pdf
    • https://static.s123-cdn-static.com/uploads/4486521/normal_5ff69dd3693f6.pdf
    • https://cdn-cms.f-static.net/uploads/4471095/normal_603c408319d28.pdf
    • http://microbladingeyebrowsdallastx.com/what_is_the_best_fruit_and_vegetables_to_eatmgyh1.pdf
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/gonagofuvute.pdf
    • https://zisefedid.weebly.com/uploads/1/3/4/7/134767142/8317941.pdf
    • http://zuduwamani.mypressonline.com/the_beatles_complete_scores_mega.pdf
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/7129228.pdf
    • http://xomunuxeju.sportsontheweb.net/35811099905.pdf
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/bamovofuseso.pdf
    • http://redit.fun/defowavavusaljjpm4.pdf
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5ffe9b0d00bda.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bivanud/63917105848.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_b42ba5dba2d949f18cd86df70f1c1dc9.pdf?index=true
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_1f8af0baed4e457180646f08042a8e66.pdf?index=true
    • http://dozopedatofol.atwebpages.com/pudovetotuvetixavatafabej.pdf
    • https://s3.amazonaws.com/tobito/60930244088.pdf
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_e90f3846ddbb4a70b3f1b4478cceecc5.pdf?index=true
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_706bc2c1c8954f0caa0c6cff02e1fc73.pdf?index=true
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_6468ee538bfe47b38e118ebe89da3433.pdf?index=true
    • http://padusij.onlinewebshop.net/beats_by_dr._dre_-_solo_pro_wireless_noise_cancelling_on-ear_headphones_-_black.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c1.bin
04050aafa401b5cc0821be438424824fc156ade133e4a3348db5809f20cba6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 2192 bytes
font_01_sfnt_off0000eba7.bin
cdeb3546e2b4f111d202df06699b519da4639317e7a87f5340e3c43b22b7b690		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 4824 bytes
font_02_sfnt_off0000fc1a.bin
7738125f5436fb64fcf1a7f0007bf0f20f234600f0cddc30b96d1c6e2783255b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 11916 bytes
font_03_sfnt_off000122c8.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 4324 bytes

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