Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20c07b891032013…

MALICIOUS

PDF

75.2 KB Created: 2021-03-04 17:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b20868be203a0b1146973c77b5fcd12b SHA-1: ebba2e74455bac24f15bc0644f70edef5e7f6237 SHA-256: f20c07b891032013ae6bdfd13c2f6afa2f6c8d7c9f40c36a7ca5c31c3f5414e5
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, identified by critical heuristic firings. The document body, though heavily obfuscated, appears to reference a Nespresso product, suggesting a lure to trick users into clicking the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=nespresso+aeroccino+won%2527t+turn+on In PDF document text
    • http://juwupexutaval.mywebcommunity.org/why_is_my_tv_screen_have_lines.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/what_causes_increased_parathyroid_hormone.pdfIn PDF document text
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/9295042.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/befesamuja.pdfIn PDF document text
    • https://rugibabolunape.weebly.com/uploads/1/3/1/4/131454120/038e3062.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/avadhuta_gita_english.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/how_to_connect_my_bluetooth_speaker_to_my_roku_tv.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/xiwopimesa.pdfIn PDF document text
    • https://mijipunipiju.weebly.com/uploads/1/3/1/4/131455283/43e9aba956a775b.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/how_do_you_drain_a_frigidaire_affinity_washer.pdfIn PDF document text
    • https://dufibivi.weebly.com/uploads/1/3/5/3/135346242/joxotubidagedu.pdfIn PDF document text
    • http://folejaf.mypressonline.com/13342879652.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/7323098.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/nimuf.pdfIn PDF document text
    • http://neditaxuvim.getenjoyment.net/faragig.pdfIn PDF document text
    • http://nefozufovi.scienceontheweb.net/what_are_the_theories_of_risk_management.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/xirozipo.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/jozetej/22654205178.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/antifreeze_50_50_safety_data_sheet.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/moto_x_2nd_gen_battery_percentage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e90c047-56dc-45d6-be08-db2b7514412f/the_maze_runner_4_full_movie_subtitle_indonesia.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/jedigumuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5079a29f-acb6-4abc-a46f-d80e6ce62796/dotepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ef8fc2-95cb-409f-adfc-bb5b1b4467c8/wujifakogopa.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_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 4988 bytes
SHA-256: 5aae30deb52004af877d099a9662a403bc5250bd76279cf1e125b1fe3d0d3372
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 11308 bytes
SHA-256: 32bf4437642bdec4d97224212e67d52c62fce5f5a566c8e655c4116405633c09