Malicious PDF — malware analysis report

Static analysis result for SHA-256 099da31d7d605f73…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 09:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 671b01368dfecb66972b9854c275811a SHA-1: e4b671d9081a7d626832bf9c2ea932a504f38bb7 SHA-256: 099da31d7d605f7377f1a1f93a434731f5988c2a08de73c7a66099b36e384279
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to 'social anxiety workbook cbt', suggesting a lure. The numerous embedded URLs, many hosted on disposable domains or link farms, point towards phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=social+anxiety+workbook+cbt PDF link annotation
    • http://xawegap.mywebcommunity.org/que_organos_conforman_el_sistema_circulatorio_del_ser_humano.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/odyssey_fagles_audiobook.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/rusur-menunavu-xedunututuzozig.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/jawena_kinogex_wujofozasuka_jazomel.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/jerhajf/scary_skins_for_roblox_boy.pdfIn PDF document text
    • https://kesiwupi.weebly.com/uploads/1/3/1/4/131407351/xojugifugevinur_pedij.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/ghgjjjj/grand_theft_auto_iv_the_complete_edition_ps4.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/fawugidiwuvofodajuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/walamalesumi/j3che1d/influence_meaning_for_kids.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/jiduzitixulivipiriki.pdfIn PDF document text
    • https://cdn.sqhk.co/bimazizuxu/wgchhbh/literacy_play_centers.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/2010_camaro_ss_for_sale_los_angeles.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/fathers_and_sons_volvo_west_springfield_massachusetts.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/suretedunanavu.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/bulujono/ntse_exam_answer_key_2017_tamilnadu.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/dark_souls_3_guia_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/celtic_rangers_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/hp_officejet_pro_8625_printer_error.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_off0000e00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00E 5184 bytes
SHA-256: 39ec0c6e7bc5f770eac5ee42b561cab6a43f94d21b600cfd692a497ac4b3cbcd
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 10376 bytes
SHA-256: b3d7e1716113920532e3813f56f907ca6716679a0ecf696deb8a38475866aef0

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