Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac397bc946961969…

MALICIOUS

PDF

89.1 KB Created: 2021-03-29 21:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55ff8dc2af925203fc165baf687b40b SHA-1: d2aeac3f44fc4b6f301eceed41bc69f9077ccf5f SHA-256: ac397bc946961969afa695fcda6faa92dd24de4a0e4055736e44f678f721f6b7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'jumiwimov.ru/strik', suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains keywords related to a product, likely used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=cuisinart+ice-30bc+replacement+bowl
    • http://botanilix.mygamesonline.org/giwurazosef.pdf
    • http://manamuposa.getenjoyment.net/jedi_i_trci.pdf
    • http://insurancesouk.com/bunamekxb71.pdf
    • https://cdn-cms.f-static.net/uploads/4408348/normal_60192951db919.pdf
    • https://static.s123-cdn-static.com/uploads/4371791/normal_5fdeb180650c3.pdf
    • http://formulamoney.top/15099864128ka0qq.pdf
    • https://cdn-cms.f-static.net/uploads/4378606/normal_6047154067865.pdf
    • http://mowefopovog.mywebcommunity.org/43470900110.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_b967fb2249cd45068636fe836bea5251.pdf?index=true
    • https://s3.amazonaws.com/domegagowevag/chakram_ringtones_free.pdf
    • http://jofijegisa.atwebpages.com/cours_informatique_algorithme_et_programmation.pdf
    • https://s3.amazonaws.com/limepusotanal/spanish_mackerel_nutrition_information.pdf
    • https://s3.amazonaws.com/dezajok/badmash_dil_instrumental_song.pdf
    • https://s3.amazonaws.com/xupovobejanam/industrialization_spreads_answers.pdf
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_c24f7cce79fe42e28c76cac813145ca4.pdf?index=true
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_1f72f678bb174863a3b87bb03177e9d1.pdf?index=true
    • https://s3.amazonaws.com/ganubatebedoxez/95702013045.pdf
    • http://tapoloferazuziw.atwebpages.com/hp_laserjet_p4015n_toner_compatible.pdf
    • https://s3.amazonaws.com/fotojipifuzitul/armitron_pro_sport_watch_manual_40_8284.pdf
    • https://s3.amazonaws.com/guwutivupudutu/81346655526.pdf
    • https://s3.amazonaws.com/defipedibe/nebuliwezekokaredetusa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd86.bin
58baa14ef14a27b84fbaa8593efa820f092ddc334bca63f9394f32b52734d218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 5552 bytes
font_01_sfnt_off0001105d.bin
107d721aa028de6d8d7bcfc7d3bf8a5e6039e8e02abe969502c98a93d1cbf65d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105D 11160 bytes
font_02_sfnt_off000136bc.bin
fdac1fc07045ac4958c842eddf712f58cdcedb99bd9d41cdc6caead42d45ca88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136BC 18900 bytes

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