Malicious PDF — malware analysis report

Static analysis result for SHA-256 487b0c911befbb4f…

MALICIOUS

PDF

75.5 KB Created: 2021-03-04 01:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 618361b69291e3847466221094acc800 SHA-1: 211d4ca50839913dcd02906123eb36f54841c6cd SHA-256: 487b0c911befbb4f3e75c66a288e6add161bcc565e09436b80b86456d2f7ddf0
146 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing lure. The document body, though heavily obfuscated, contains text related to setting up a ventilator machine, which could be a pretext for a technical support scam. The presence of numerous external URLs, many hosted on disposable domains, suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/strik?utm_term=how+to+set+up+a+ventilator+machine PDF link annotation
    • http://pixell.store/movie_wallpaper_app_for_iphoneqsdfc.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/how_to_get_philips_universal_remote_to_work.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/rogitege.pdfIn PDF document text
    • http://afracheat6.xyz/capacitive_voltage_transformer_pptksq3v.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/27058059473.pdfIn PDF document text
    • http://tulusujubige.mygamesonline.org/how_to_remove_samsung_computer_monitor_stand.pdfIn PDF document text
    • http://mizebojusur.mypressonline.com/how_do_you_fix_a_golf_cart_battery_charger.pdfIn PDF document text
    • http://o-karte-kopilka.com/40596044129v5b2f.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/what_curriculum_design_is_k_to_12.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/76954848899y3yul.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/shoei_neotec_2_srl_review.pdfIn PDF document text
    • http://pojorabe.iblogger.org/math_picture_books_for_4th_grade.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/defujo/wogubururi.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/vehicle_insurance_premium_calculator.pdfIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/swann_security_camera_system_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/16249700192.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_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 5288 bytes
SHA-256: e693168b6fc9ac1a81bcb8cc8f48f305c4d182f596427735f739946f0884a3f5
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 10352 bytes
SHA-256: 621b38f2227ec2ed39568141b33fb7b4b55b13c5b2368870222f3727117ebb6e

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