Malicious PDF — malware analysis report

Static analysis result for SHA-256 4897e2e75f4c5d13…

MALICIOUS

PDF

76.4 KB Created: 2021-03-25 14:52:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70d8580dfcd69b16e7366437c7626596 SHA-1: b881184f732c7af42c22b0d10529d75e0d7b3460 SHA-256: 4897e2e75f4c5d1392ba1ce0f08d87d3febf405127accc9041265744829cde5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious and phishing-related. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or content distribution network for malicious content. The primary URL, https://dafemum.ru/wix?keyword=community+recycling+center+brampton, indicates a lure related to community recycling centers, likely to deceive users. No scripts were extracted, but the extensive use of external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=community+recycling+center+brampton
    • https://cdn-cms.f-static.net/uploads/4379851/normal_602d3e41958b1.pdf
    • https://pareruli.weebly.com/uploads/1/3/4/8/134891857/47160.pdf
    • https://cdn-cms.f-static.net/uploads/4456676/normal_603201a3cf70b.pdf
    • https://xizafezepogoja.weebly.com/uploads/1/3/4/4/134446531/7599504.pdf
    • http://sebevifa.getenjoyment.net/36629152338.pdf
    • https://dujililapute.weebly.com/uploads/1/3/5/3/135347223/tebizalapifa_dezajoviri_xuxasekopozobur.pdf
    • http://vegunax.getenjoyment.net/rudewusaravasibugu.pdf
    • https://teveluzisobe.weebly.com/uploads/1/3/5/2/135299025/1899076.pdf
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/zegowokejarab_sejewuduk_samaje.pdf
    • https://cdn-cms.f-static.net/uploads/4377656/normal_6038b51eb0c88.pdf
    • http://jejederepox.medianewsonline.com/47639497052.pdf
    • https://static.s123-cdn-static.com/uploads/4382003/normal_60009e61d7173.pdf
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/35d3af3.pdf
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/gujin.pdf
    • https://cdn-cms.f-static.net/uploads/4484818/normal_5fd6ec935f6c8.pdf
    • https://cdn-cms.f-static.net/uploads/4484355/normal_604d8e582f6d7.pdf
    • https://pebujekug.weebly.com/uploads/1/3/4/3/134380671/683eb164e6f.pdf
    • http://daxavepevepa.mypressonline.com/satomid.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/4119793.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lazuletezofik.onlinewebshop.net/arcgis_10._1_tutorial_download.pdf
    • http://lipabarud.atwebpages.com/basic_concepts_of_probability_theory.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2a.bin
254ca7e54c1b15316e4432a70b015637b3f1b748246b694440f22cb6b705575b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5224 bytes
font_01_sfnt_off0000ffdf.bin
d54e85e6c55c81434c7e028a1cde2419b37e767e901d313128e2b9c749343e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 10648 bytes

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