Malicious PDF — malware analysis report

Static analysis result for SHA-256 58598478307a926f…

MALICIOUS

PDF

75.9 KB Created: 2021-06-07 03:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f301e800d5523ef555ec29a9e48fe29f SHA-1: 5829c5d46a61ad273854b0c09863e7ade767d4b9 SHA-256: 58598478307a926f95a9a590e6e325a0d4e25f7fcbc52e6dc1952451ff1a4d69
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URLs are likely intended to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/pbw?utm_term=problemas+matematicas+2+primaria+pdf PDF link annotation
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/8c26dd41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_60195a26e5700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5fca025a4168b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393626/normal_5fe35f7aedac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421224/normal_60292b1420db5.pdfIn PDF document text
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/lonalomalarilodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fe6399086d01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fc87246bb79a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fe45efc8ac1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_600b6d1e9d5d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_60bbd515ee7ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477620/normal_604cdb0e76ee8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6037d8aa55ae4.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/noxuzalovanake-wonujotinir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5ffc984b6e87b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450640/normal_5ff15bed2fba0.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4464082/normal_60b26195107e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375352/normal_5ff3f4801f98b.pdfIn PDF document text
    • https://fusewire.weebly.com/uploads/1/3/0/7/130776481/tulugedaposup-gebotidi.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/d8937ffed85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6005f6de5ae7c.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/8cdf149a-8fbc-434e-b29c-65b4db86e1c2/guxofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d06b1e0f-7704-449b-8e13-77485fb6bb8e/dwg_file_viewer_online_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74730f3-d162-491a-9a85-dcaeec29a529/15872168109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fee1d5d-c006-4cbe-929c-370572cedec4/a_song_of_fire_and_ice_board_game_review.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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 5572 bytes
SHA-256: a3d6e0698dd2ee46b85c38358fc5ea46dcc43a9e77cbdcb0333eb3c828f772b1
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 12332 bytes
SHA-256: e9704325de00ce1971be4da340a58de2e23df5926d6626424c7c84b5af8aea44