Malicious PDF — malware analysis report

Static analysis result for SHA-256 903a1de545a9ca91…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 07:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3cfb4cfa1666d5f3dce4a58556b32ecc SHA-1: c9bfc9e81c3df62ec8da73777eb7c2e5eb3a0323 SHA-256: 903a1de545a9ca91cadaa7f37dacd12d398e6f818de608ebbee0bd4c6f46e91f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/strik?utm_term=client+service+representative+resume+sample PDF link annotation
    • http://quickpapp.online/879564826492872g.pdfIn PDF document text
    • http://gimepar.22web.org/principios_de_marketing_agueda_esteban_talaya.pdfIn PDF document text
    • http://koprovk.xyz/nursing_care_plan_for_abdominal_painb1axf.pdfIn PDF document text
    • http://artistichomesolutions.com/vafesugiwcnpxz.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/bdd_in_action.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/what_do_personality_colors_mean.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/revonemuleje.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/uIhfkhh/sintomas_del_cancer_de_piel.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/jgharhd/39712370869.pdfIn PDF document text
    • http://c-advance.space/869700759014sgyi.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/giohj6J/tip_top_barbershop_calgary.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/turbo_manager_app_for_android.pdfIn PDF document text
    • http://huseyincanx.com/845406686205slo1.pdfIn PDF document text
    • http://xufukutuvunimif.22web.org/final_walk_thru_checklist_new_home.pdfIn PDF document text
    • http://zekinaperobivak.22web.org/19173374942.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://verovaweroxuxu.epizy.com/27642020756.pdfIn PDF document text
    • http://jufosuliz.epizy.com/bridges_math_4th_grade_answer_key.pdfIn PDF document text
    • http://pitudug.epizy.com/freedome_vpn_free_trial.pdfIn PDF document text
    • http://wuzuvulas.epizy.com/free_french_restaurant_menu_templates.pdfIn PDF document text
    • http://lejorusajevi.rf.gd/77670002279.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/20042457613.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_off0000f108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF108 5044 bytes
SHA-256: 5eb878b9153a4e72da59ab97af878f686e3c16c9c8e0b67de5667ae4793da7d0
font_01_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 11104 bytes
SHA-256: 91a42d964d456cc2b3237c87d52ba079b743e28677c2ea46d8340b90cd1ce6e8

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