Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0466f0652fe3a5…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 00:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c0f3cee4d6d61b9b2066f38a6f6f10d0 SHA-1: 4ac773c0af1cac88fede63adf173a9fda82e0a86 SHA-256: 2a0466f0652fe3a51fb411ad08413a950b311227338ed513db5805e79779c853
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 hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=what+is+the+supply+chain+management+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499299/normal_603fbcd8564ef.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/eeHyGha/dijanezoguliwomajup.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/kDmJ4Eu/themeforest_wordpress_one_page_template.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/angor_et_infarctus_du_myocarde.pdfIn PDF document text
    • https://xafusotegemuwif.weebly.com/uploads/1/3/5/3/135304795/5da2ba9ce2864.pdfIn PDF document text
    • https://waliruwixogipi.weebly.com/uploads/1/3/4/0/134016871/2811854.pdfIn PDF document text
    • https://zefowumuf.weebly.com/uploads/1/3/5/3/135327275/wimoseramarud_laniv_renasifiru.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/what_happens_in_the_sea_of_monsters_book.pdfIn PDF document text
    • https://wofixoxabovu.weebly.com/uploads/1/3/4/5/134524794/6d76f9239cda2.pdfIn PDF document text
    • https://tojemiwavujiguv.weebly.com/uploads/1/3/4/4/134468879/panabokilexokawipaj.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/nozafepitekamad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff7d023676e8.pdfIn PDF document text
    • https://bilugejedegigel.weebly.com/uploads/1/3/4/0/134017605/rakefepasekotajabiv.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/chcnGSG/fagufisad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466368/normal_5fccadfe5b1c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_5fd7d514b43b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_a2133fab744a4a6c858be7fcb605940c.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/96726139959.pdfIn PDF document text
    • https://0f424234-9c27-4462-a606-4b2ccecf17d8.filesusr.com/ugd/b42a09_ee71e76fdfb14925b65c16dbe29c6526.pdf?index=trueIn PDF document text
    • http://wofavum.myartsonline.com/92250725561.pdfIn PDF document text
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_334c460dbe2f4cde90d13d691bae9273.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 5136 bytes
SHA-256: 557a4b1c9a8e93a12ac7592e7611552e58523051e2e1e7e1820267c76526c901
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11776 bytes
SHA-256: f6a56e1999c47de5928d101605d04a2f3c8fb38c8415a50e0725132080d49416
font_02_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3