Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c436e8e702a7054…

MALICIOUS

PDF

78.7 KB Created: 2021-05-28 21:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c38a669383e2b70f441bde6368a1a51c SHA-1: 562a87f33663519e5638c3cfd97aa54a6a3599db SHA-256: 1c436e8e702a70547353422b44672a61c94ecc01c78eed8628af7bd39633efb9
206 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan threat. The document body, though heavily obfuscated, suggests a '3 day notice to vacate' lure, which is a common tactic for callback phishing or scams. The presence of numerous external links, many pointing to disposable hosting, further supports a malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/strik?utm_term=3+day+notice+to+vacate+texas+sample PDF link annotation
    • https://fuwivofopotafuj.weebly.com/uploads/1/3/5/3/135388640/2272884.pdfIn PDF document text
    • https://faxefijuw.weebly.com/uploads/1/3/1/8/131872096/baxekivukesu.pdfIn PDF document text
    • https://zojivevu.weebly.com/uploads/1/3/6/0/136090852/gapotexo-vizufigad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414679/normal_602426923dc6e.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/gifez_segejebijapufed_zojosefejak_zunosedik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5ff4c69f83af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_60651dc6a145b.pdfIn PDF document text
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/gitozijilen-marijazixel-tadim.pdfIn PDF document text
    • https://zosolino.weebly.com/uploads/1/3/4/6/134676828/patiwojodikinemegov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408595/normal_6063961c34517.pdfIn PDF document text
    • https://kuratoso.weebly.com/uploads/1/3/4/3/134329811/tipig_wifofuv_tojelekeba_riferereni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418786/normal_60375899d2f09.pdfIn PDF document text
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/4553064.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/5af52d5a-55a4-430a-9c5b-1f0693b237d2/functional_movement_screen_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3057674-5941-4c94-a39d-edb06fde3aef/is_kirby_star_allies_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159bb271-42a9-4d78-b606-d4de8fe47eef/88216583262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861d93f8-0ee6-4634-ad68-429d1ac02d32/celebrate_recovery_step_study_lesson_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd529f97-5815-432a-8f17-0eaeed178ac7/dometic_15000_btu_duo_therm_brisk_ii_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f0e38a-3b72-4e2c-8a41-5f29fa9e5350/59709875935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b00dc14f-aa5c-435e-b4df-d411105d7cdd/identidades_trigonometricas_de_cociente_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13234b64-ea2f-4bcf-9f61-1efd4e334a41/zorewipukutogepavolopeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2042cf5-aed7-442e-957b-576f14c2ee8b/reset_ink_pads_epson_l3110_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aace47c-183d-49fd-bcd4-4acbca2fd4f8/perdona_si_te_llamo_amor_pelicula_completa_espaol_castellano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2392d34d-512f-4123-a083-e7b2448b7ae5/75745851003.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_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 5424 bytes
SHA-256: 341194de0522f3b6e091ad6a760969db51a181dc8afc126eb3b1ba4875f7ec0d
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10816 bytes
SHA-256: 4a4d535363ec756e89278fc00cb1e3939df0e8ef61290e47d47d7638d3fdf3c8