Malicious PDF — malware analysis report

Static analysis result for SHA-256 a972b886020ac366…

MALICIOUS

PDF

84.1 KB Created: 2021-04-02 13:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 64fdd24c12aa3ddbe3f6b7badc002237 SHA-1: b66d1b20cea671a5e9bfbc53c05bf426c5db44bd SHA-256: a972b886020ac36664883a27c30492d713ce0c38ee3c1f28198c740a73e7efc0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain. Heuristics indicate a link farm designed for SEO manipulation, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://mezovuduw.ru/123?utm_term=pumpkin+carving+templates+jack+skellington PDF link annotation
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/2168912.pdfIn PDF document text
    • https://ronojunigamedez.weebly.com/uploads/1/3/5/2/135297775/fudif_zutafeko.pdfIn PDF document text
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/4305591.pdfIn PDF document text
    • https://bitoxogosem.weebly.com/uploads/1/3/4/3/134386372/504623.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/tikagetalapol_lujolelixura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_9d79718acfc041cd8afb3bfe441a6ed0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0171f7f-ad9f-4f3b-892a-1c51a342a12c/zigalevufifikimotatud.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_d590fc34b2cc4e389219ed6b92ff3cb9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cab88e5-e392-4e17-8962-3b080ef2535e/68899129948.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/practical_report_on_aggregate_impact_value_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd0178c-299b-4736-989e-9e6599739779/kotonusu.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_044725a7e54c4b8491911e27926406be.pdf?index=trueIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_49a67a7fb4de4480aa45d5972c2317e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4ddbc4-08d8-41e5-aeea-646dfe486a72/2nd_grade_math_quiz_printable.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_cfba0ed6ce9c49d7a629e67d8087a413.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b76f70-5b19-49cc-b927-53d9a2ba1e9f/list_of_all_si_units_in_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5d8b15-3dbe-4a90-a894-12934862ad34/sundance_hot_tub_flo_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1d17e2-726f-400a-9ac6-38b6688eaaf5/patton_m._q._1990._qualitative_evaluation_and_research_methods_2nd_ed.._newbury_park_ca_sage.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_b1f94ab5099347a982e73ac0441d3532.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b897b5-af6d-4b90-9f1a-ff65f4fb1636/mujagixivikovave.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_1f1a9eec6e964c5496e625a57337a0a7.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_8b559c29d7904409b9c167ca8ec77ba7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/82917149075.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_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 5452 bytes
SHA-256: b4413374b1df9fb67badbe2565329f14fed3c45712e54d44802f86f5ffee8244
font_01_sfnt_off00011f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7F 10320 bytes
SHA-256: 23710620a9f1b5371ba227aa251566954135a2223c083f895562a3e3a78e3cc4

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