Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b075caaf892339…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 01:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3533451cfc2f4544bdae24cb3a0a17b1 SHA-1: 8f98fed8876951298e545923d8f2fd9c0eabbbcc SHA-256: f4b075caaf892339cdf4cf3b3f5e2f3946e4d212c6dffdf6c67e65969c189517
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's structure is designed to host many links on disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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://seumenha.ru/wix?keyword=1953+cadillac+fleetwood+for+sale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497082/normal_5fe827e3d6635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449599/normal_5fee9fa7ab2e8.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/64271644209.pdfIn PDF document text
    • http://sifuzifixezija.medianewsonline.com/jedijonopiler.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_60095364d4904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468553/normal_601bc39e47f92.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/1O3jdRj/88285601189.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/lumipexegerivotugerapiveb.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/53050054061.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/ejajeq1/13490373456.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/canadian_citizenship_practice_test_by_chapter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_2b47e7271cef41a2a851633d582fb07d.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_09e57fcb51094b9c9d07630a3cda61d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43e5fcf3-d7a4-4c32-87b1-88d03b7f11d0/simexaxafewofobaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ca3678-6e80-4b89-82c0-6069511a189b/65951995508.pdfIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_2f0612cec5924dd687499bb907cdc019.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/pofazemipivebabatuligetis.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/form_utility_definition_marketing.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_93a864226ac74bab891482272cd3f72f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78718aca-3d5f-4faf-9cf7-f42c7f6d89c1/3593485269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b9edb0-fa46-4665-a6a5-c43a74202eb3/25322456338.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/modern_pharmaceutical_analytical_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/how_to_contact_dmv_by_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83255a8f-a73a-4107-8d27-4e454398ffce/grey_oak_home_office_furniture.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/cuales_son_los_5_sentidos_del_cuerpo_humano.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_34da90a9935c42f0bc278ea126a06eb6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 5192 bytes
SHA-256: 94c66e1bead943758b818739452f0ad9f7f8261e8f82d02ecad28e59923b3b8e
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10532 bytes
SHA-256: 00364a5457dcb4e57d30d25a9a67a593d9428a2654b8fd953654623fc7f1e116
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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