Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf7921b15b9f679…

MALICIOUS

PDF

126.4 KB Created: 2021-03-24 05:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b98b6a06561b9eaf3f4ddd6c036396fb SHA-1: 287588f4606cc8fac322fdb8060c10fc7b12964d SHA-256: acf7921b15b9f6799c62ddf1f4181a291accfe1335235caa4afbaff60f8aade8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, and includes UTM parameters suggesting a tracking or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the PDF structure and external link farm heuristic suggest it's designed to redirect users to potentially harmful content.

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 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://fokemale.ru/strik?utm_term=nse+stock+symbols+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484097/normal_604cc8b10c4f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_605716ef4ac30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497638/normal_5ff1e5fb681cf.pdfIn PDF document text
    • http://besuxiju.22web.org/safevupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_6044fe2e07aad.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://uploads.strikinglycdn.com/files/337e79f0-a9ff-4ad2-9c9e-c3fdee154712/judofufo.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/jalekiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45676522-f12e-4ada-8d98-8e11bd5f3b93/pronoun_exercise_for_class_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fefdb6-6dbe-449b-ae70-d297f0fb144f/34405720448.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_3c18b10f1a46440a9aa220fc2ede755c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a459bbf-a145-42cf-aa21-3e77ef016602/starcraft_remastered_steam_price.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/62155020439.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/jupox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6d6a062-ed58-4787-8a8b-97ac8db749fe/civil_engineering_fe_exam_pass_rates.pdfIn PDF document text
    • https://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_60f1ba139c924e219fe9e28409c2ea7e.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_2e327eef451b4289ae1fd4b80214095f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef0109b-8a84-4b16-978b-0c1c5b5db53c/vusuzifuzelimegope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c27b82-095b-453c-8be6-17f02ed3bfed/takavugusukiwojukubulikij.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_eaaf808247e44bdbb6a69ea08e673b67.pdf?index=trueIn PDF document text
    • http://tinorojuneguj.rf.gd/shell_script_if_statement_multiple_conditions.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/rovupufuraniruvajiwe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E4 4596 bytes
SHA-256: 3fc8061949f12e4447e6f4737502a001127a30c2af96c0893b2bdccba0f7aa5b
font_01_sfnt_off0001b69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B69F 10980 bytes
SHA-256: c49979d45cb9dc0d7916c5c9bac8e09f62f126ffd88e4c1bdbb01dca6655ff88
font_02_sfnt_off0001dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC53 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f