Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7707985ca56918…

MALICIOUS

PDF

88.9 KB Created: 2021-03-31 18:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 91e0f3d91fe9caea99ad0c25e8cf5a12 SHA-1: b38a93af4f8e3c8c87cca895f8fd3f17c174c948 SHA-256: 7a7707985ca56918a713c20b31678a37f86d9501c7357bfafec2344f9360dce7
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with several hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=branding+strategies+in+marketing+pdf PDF link annotation
    • http://rapanus.22web.org/76994427338.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/wudexudamogoxagamidu.pdfIn PDF document text
    • http://siteznakomstv69.space/first_aid_kit_emmylou_album62jdy.pdfIn PDF document text
    • http://timecodes.net/how_to_flush_mercury_9.9_4_stroke3y7r1.pdfIn PDF document text
    • http://qlemelest.online/50414638025x6x5i.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/6051385.pdfIn PDF document text
    • http://getubij.66ghz.com/closed-_ended_answer_question.pdfIn PDF document text
    • http://virona.org/on_my_block_cast_spooky_brotherab09c.pdfIn PDF document text
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/1557165.pdfIn PDF document text
    • http://sait-ok.ru/64702563326a7y5o.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/rexokaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/18293030025.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/88463069942.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/arrte_avec_tes_mensonges_besson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99521e2-d448-44c5-b871-9a78df1a19f3/63433281783.pdfIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_be7dae72c6904158b98a06c7cafed783.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9ebc16-d163-4132-bb16-69710ae0519b/kexomonewinogaxati.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_8b38b0f4dc2344b7aecf613cadc69b7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64be4d9-3357-43f7-9392-3e8e5d11cdea/state_of_ct_form_reg-1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91897177-d3a4-4bfc-8392-139bac1f563c/how_much_paternity_leave_are_fathers_entitled_to_in_ireland.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_d9fb133c5aff4ecb98e5498b57dabbf6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 5440 bytes
SHA-256: 829f42cf63e0695280b4b5b11cc4380c76f07c6d6ff9c3ff568036455a276242
font_01_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 10928 bytes
SHA-256: ea0d478b3baf0e0f04dd4acd12a9182f36e09f201371c4378f82a3d48b335706