Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc28c3aefac8349…

MALICIOUS

PDF

85.0 KB Created: 2021-03-11 09:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f62d1fdfa156722d060a4b1a7177c6f SHA-1: 5303928a40a8bbd1e9b95fd48d48a501997bc920 SHA-256: 5fc28c3aefac83497b6bdeeef787b2e1c36bc9573092fd6d52fddecc69825e05
146 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristic detections indicating it is a phishing lure. Specifically, the 'SE_CALLBACK_LURE' heuristic suggests the document prompts the user to call a phone number, likely for a tech-support scam or billing fraud. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=net+force+worksheet+answers+6th+grade PDF link annotation
    • http://graatorama.space/how_to_reset_an_armitron_watch_wr165nte6l.pdfIn PDF document text
    • http://cabinetsop.xyz/the_simpsons_game_of_life_board_game_rulesdlhgq.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/28234044673.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/vewewovuwujagudobav.pdfIn PDF document text
    • http://yewes.space/183865874014xvbw.pdfIn PDF document text
    • http://bella24.xyz/kindle_send_email7znjr.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/bitiz-muzufexekokafox-xodukov.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/como_agua_para_chocolate_personajes_descripcion.pdfIn PDF document text
    • http://d2-club.ru/cable_size_calculation_formula_ukixevx.pdfIn PDF document text
    • http://vasowenotaruso.22web.org/sowal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c104b6-53ec-4baa-86b6-b30d02f5777a/9486280767.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/what_happens_when_you_get_doubles_in_monopoly.pdfIn PDF document text
    • http://zefitog.epizy.com/poulan_pro_20_inch_chainsaw_chain_size.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/fingerstyle_tab_books.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/magnetic_field_dc_current_measurement_sensor.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/likebado.pdfIn PDF document text
    • http://viniwowosur.onlinewebshop.net/why_does_it_hurt_to_look_up_at_the_sky.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/mulexiralijef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5661c0f2-a6ac-47c0-994d-5d7164638ec0/5512641009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf681e2-8d35-4daa-810a-cdd4287a7ec8/best_cabinet_for_peavey_6505_mh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caeb49ba-9687-4283-9960-2f2c770d1f76/65020260864.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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5528 bytes
SHA-256: 5a1434d4089099c4949d5a3694759f2a968169f48e9ac24aa81b9d77a257a938
font_01_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 11176 bytes
SHA-256: d3f53cb686b63b0e5e02db747a36330d69b022b5780a58020e3bc39139138369

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