Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f629a0eefc29b7…

MALICIOUS

PDF

70.1 KB Created: 2021-06-11 09:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05228eaaff092658439970a585f77def SHA-1: 55516b6bf41f7858a988555110fbe14fb49f31bf SHA-256: 36f629a0eefc29b75eec9985a78babfc5ba476988df8215a849e6e67b559a914
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The document contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure, directing users to potentially harmful sites. The presence of external URIs and link farm indicators points towards an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ketchas.ru/pbw?utm_term=best+samantha+jones+quotes PDF link annotation
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/d79d1a.pdfIn PDF document text
    • https://dovekawelefirim.weebly.com/uploads/1/3/4/2/134266448/desoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fff4dac2ed22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5ff57499717b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411709/normal_601b3a64ba513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_600c759519da6.pdfIn PDF document text
    • https://modovepa.weebly.com/uploads/1/3/4/4/134464072/lexemux_goduripu_pojuwoxuguwad.pdfIn PDF document text
    • https://xufujakuzizam.weebly.com/uploads/1/3/5/3/135315974/8d59ad3a4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370987/normal_600892c2bdc8e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486745/normal_60b24c9e87807.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/3226360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakerul.pbworks.com/f/alcanos_propiedades_fisicas_y_quimicas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22c52e7-2ef3-4675-8bbf-99b85040d215/adjective_and_adverb_phrases_worksheets_with_answer_key.pdfIn PDF document text
    • http://bibosopimugo.pbworks.com/f/how_do_you_find_kanais_cube_in_diablo_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997e7640-f0b4-46bd-af9c-9d14d4991e41/tiviraw.pdfIn PDF document text
    • http://momukaduwe.pbworks.com/f/remote_mouse_pro_apk_full_version.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/how_to_open_a_sentry_safe_without_combination.pdfIn PDF document text
    • http://dadilotofexi.pbworks.com/f/98732016783.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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 5048 bytes
SHA-256: a4e6666feed23088b6549335a5fe70d73e055598e35d1a465bd10249a5d3397d
font_01_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 10756 bytes
SHA-256: fac1a12b89c3673c89b17bea98a0c8ed3de6975cbd6e1c05c1324230eeeaa006

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