Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5acd601e93e6159…

MALICIOUS

PDF

74.0 KB Created: 2021-06-09 08:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5e066e9f5628c178890c2e6167b8d606 SHA-1: 95d7cf68e42034c8e9ab82ed21310e5107bc4dc0 SHA-256: e5acd601e93e615976dbb3b2ec1224c6a3b95ed8d4a891dfe0c82551f07fb179
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic and a malicious ML classification further indicate a malicious intent, likely to trick users into downloading malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are strong indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/pbw?utm_term=damon+ps2+pro+emulator+download+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495262/normal_60186257158cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406789/normal_5ff779eb78714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_60bd9d1c505af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_6027f986bf28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_606e118f26574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fd61d77e1ee0.pdfIn PDF document text
    • https://gufonalika.weebly.com/uploads/1/3/4/0/134096228/tuzav-dozitepukaguke.pdfIn PDF document text
    • https://kixufeme.weebly.com/uploads/1/3/4/0/134018387/48b062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_60bb1767cf6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_605483ed7bef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javefanudosa.pbworks.com/f/are_congruent_figures_also_similar.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/f/area_y_perimetro_de_figuras_planas_ejercicios_resueltos.pdfIn PDF document text
    • http://vevokofeju.pbworks.com/f/how_to_pair_alexa_speaker_to_phone.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/patoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e86cd9e-d543-4e3c-89b2-3adcadac9c00/4275684049.pdfIn PDF document text
    • http://xibosini.pbworks.com/w/file/fetch/144738384/how_to_win_roulette_game_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a528569-5f2a-46d3-ba22-994c6f60079c/vewex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f588da0-5b03-470e-84ee-7c5c6a7b51bc/42973795782.pdfIn PDF document text
    • http://leviwim.pbworks.com/f/ram_narayanam_janaki_vallabham.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144910356/gta_5_apk_ios_free.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144447258/what_is_meant_by_reverse_barrier_nursing.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_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 5412 bytes
SHA-256: af4fe6f27b076c396ba089cdc4715bdfc046bea793391cb4d59837ad3dfba364
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10556 bytes
SHA-256: 2bad22baf5d184dd28d6081e4e9019e249208737813605162d835b493d566c37