Malicious PDF — malware analysis report

Static analysis result for SHA-256 5685c4bdade643a2…

MALICIOUS

PDF

92.4 KB Created: 2021-03-27 23:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4746b42f17ac8ba377854f16c520c8e6 SHA-1: 57d572b87c8302d3558fe9a05c2800f3ef6ae054 SHA-256: 5685c4bdade643a207dd65a6cefcd661b0bf2f3b1696b9c7410d291fa02bd910
186 Risk Score

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 0.9992

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://jacksth.ru/award?keyword=abcesso+cerebral+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370285/normal_601937e10f7d3.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/9xhjj5t/zenivokoboporubi.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/2305853.pdfIn PDF document text
    • https://xapenivivafozeb.weebly.com/uploads/1/3/1/3/131379266/vujadakaw.pdfIn PDF document text
    • http://kisedevobale.22web.org/nuzivodujabumoxuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_605bff4945769.pdfIn PDF document text
    • https://cdn.sqhk.co/tezesafura/7AchbBc/dead_silence_movie_in_tamil_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443804/normal_5fcd3d90b5734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475016/normal_5ffaafb31afa6.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/ij66jdb/puvabamuvawule.pdfIn PDF document text
    • http://roralukomoko.22web.org/linksys_ea6400_download_speed.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/951df9b71df2c.pdfIn PDF document text
    • https://lobubanir.weebly.com/uploads/1/3/2/8/132814664/gusowinosureted-fobedinolebogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411481/normal_602d3ecdb4b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidadefaj.epizy.com/91655483135.pdfIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_77a64f075b2246bc84aae78ddbdc67eb.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_a3e21f04a6614fc1b4a654dcacd03d63.pdf?index=trueIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_5009ad6a5b564dfa9f00aa4fe5b138ea.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_8552dd69a24346f4bd85d1a9f2767e07.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_e925d0b5caf64276ae33a2e4b8be60f7.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_8dfd2f8c57074a50954a20fc54d1c179.pdf?index=trueIn PDF document text
    • http://kurejewupom.rf.gd/popogezogurituko.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/70785984677.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_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 5276 bytes
SHA-256: 6487ba7cb8d9f1e5bdf3df25d761daec84a48631a287b58df27c6f6f9717bccd
font_01_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 12492 bytes
SHA-256: 8539853bd5d4f3a93986bb1507dc262c69365b211130acaee517bdec8872ee6a