Malicious PDF — malware analysis report

Static analysis result for SHA-256 e237df5e97b150a8…

MALICIOUS

PDF

78.7 KB Created: 2021-06-09 19:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ef08461cb95cb53d0040c95944e44e0 SHA-1: 24b13a6eb8ed8cec1b6a324a0cecc5f98a0e68f4 SHA-256: e237df5e97b150a86da3daf6b19a5107950d2ea2d2f0b007639fa9f4d93f6631
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of an SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/pbw?utm_term=how+to+on+the+laptop+keyboard+light PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383132/normal_5fe5dde26d675.pdfIn PDF document text
    • https://josapepukixo.weebly.com/uploads/1/3/1/3/131384602/rexaguvomegedi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_60062d3140b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_603c4c7ae3474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415964/normal_60486080a54a4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4492253/normal_60b3ec32a7b9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386822/normal_600254e659a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fe783ae76579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_605c1500c3738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413244/normal_5fcea2c26ddfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5feb6cb1dcdbc.pdfIn PDF document text
    • https://rinosebamajipem.weebly.com/uploads/1/3/4/6/134694393/eb231535fa08de.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/girikesij_xujuziwuxirilu_mesunemuse_zomugeberiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_60555d299f280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6052c4cacf884.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_602257b64eedb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_60183c03e6a1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed63f32-d816-4124-9e5e-b20bb3fb7d04/how_to_start_a_descriptive_paragraph_examples.pdfIn PDF document text
    • http://febamizilaw.pbworks.com/w/file/fetch/144812676/converting_quadratic_functions_from_vertex_form_to_standard_form_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8671c79-196d-49ed-a3b5-f333dd5bfb66/best_way_to_listen_to_apple_music_while_swimming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0347bd9b-1e8b-4b59-b745-f2a24fcbc8dc/tevakonasuxazusamuran.pdfIn PDF document text
    • http://zipiwume.pbworks.com/f/gta_vice_city_apk_download_for_android_free_aptoide.pdfIn PDF document text
    • http://rabumofu.pbworks.com/f/english_worksheets_for_grade_3_free_download.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/f/canto_xii_purgatorio.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_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 5400 bytes
SHA-256: d85c39a1af21df42fadb23501fa4a731c98de9bcb0220db1d7ce18b0031adb08
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10580 bytes
SHA-256: 595b39c4d4f5ceef57bdb6f196ab065ba341f8508ca6003c2b21a6900291b308