Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cb50fe7f2f9967…

MALICIOUS

PDF

67.5 KB Created: 2021-05-27 05:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab69d4ef610962a4d9f807eb782e77d9 SHA-1: 7434ed083c0cc64cbd346ace553d41c7c1fa4aa8 SHA-256: a5cb50fe7f2f9967d7f5f31d52f8c1e91630484306f79faa7aff2a849e4ebd30
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/wb?keyword=what%20is%20the%20order%20of%20harry%20potter%20books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5fe3ea14652af.pdfIn PDF document text
    • https://gorasugaki.weebly.com/uploads/1/3/4/7/134766712/6744557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_5febfcb7ee036.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/9864249.pdfIn PDF document text
    • https://pedekibitu.weebly.com/uploads/1/3/4/6/134669881/kunogetutus.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/nexijanimidaxu_mopitenemefije_pobebemawovito.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/duvajug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465914/normal_600530113d3a6.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/5749813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_603c1d31189e3.pdfIn PDF document text
    • https://ledagesobefe.weebly.com/uploads/1/3/4/3/134367542/guwokagufesomop.pdfIn PDF document text
    • https://xulisonifob.weebly.com/uploads/1/3/2/6/132695361/naxisikawufixo-voxotefuda-kojitugega-kaweniseguvedes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fe29c17d45cf.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/zizin.pdfIn PDF document text
    • https://bipesulevawitod.weebly.com/uploads/1/3/1/4/131437914/49dfa5350.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/36dcfa33-40c3-4208-9748-9e4342d192f9/can_i_bypass_the_lid_switch_on_my_maytag_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1703100-54e6-4dfb-ba84-68417f5215ae/how_to_change_the_code_on_a_liftmaster_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecbd13d-9cc1-445d-bd95-0b1dd9ace671/5617735716.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_off0000ca1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1E 5416 bytes
SHA-256: bd81648bc55ac91603b8b4c4d5e0686162fed5b9ef73f8a44e013f740fbdf36d
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10128 bytes
SHA-256: 10c165cf35f8a714994b102470b6dfbf62d3c54ee9fea2f9d650365636e5d00c

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