Malicious PDF — malware analysis report

Static analysis result for SHA-256 0451e94ad8c2cdaf…

MALICIOUS

PDF

71.5 KB Created: 2021-06-04 22:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0c9673cd77f00f0cee5e47383b6200 SHA-1: a49f28fb71a149681db9904e9a8b171c50eccd4c SHA-256: 0451e94ad8c2cdafc773cb752f75a8195095f387bb34e85ec370406aa99fd9a9
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on file-sharing services, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document is designed to funnel users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/pbw?utm_term=is+adobe+acrobat+x+still+supported
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/7b0911e2d09ca8.pdf
    • https://static.s123-cdn-static-d.com/uploads/4369509/normal_60b1b56a996d5.pdf
    • https://cdn-cms.f-static.net/uploads/4483081/normal_6017f7dfe4c81.pdf
    • https://bezowaki.weebly.com/uploads/1/3/4/6/134611163/301d50cd10f83d1.pdf
    • https://cdn-cms.f-static.net/uploads/4389354/normal_601e437c24a05.pdf
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/84e8fbf2b.pdf
    • https://static.s123-cdn-static.com/uploads/4379844/normal_60019f22e59ba.pdf
    • https://static.s123-cdn-static.com/uploads/4417834/normal_6008eae2e49bf.pdf
    • https://cdn-cms.f-static.net/uploads/4377098/normal_60135ae391e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4421215/normal_600c91cd862ab.pdf
    • https://cdn-cms.f-static.net/uploads/4458827/normal_60462402333ee.pdf
    • https://cdn-cms.f-static.net/uploads/4384820/normal_603557e52f860.pdf
    • https://static.s123-cdn-static.com/uploads/4529149/normal_5fec4ee49d508.pdf
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/8eac03a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gozuwef.pbworks.com/f/juladelikidujuwepi.pdf
    • http://poforezufovu.pbworks.com/f/4545622719.pdf
    • http://jajisaparev.pbworks.com/f/dufokusuwojuni.pdf
    • http://xiwitanul.pbworks.com/w/file/fetch/144441960/fenito_akll_fen_bilimleri_defteri_6._snf_indir.pdf
    • http://bezawagiga.pbworks.com/f/meteor_hitting_earth_2022.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_off0000da86.bin
32ed12860be52edc5860f7ad6311dcbf8d93c193f8b96399fb3d7e8d4c7dfedd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 5212 bytes
font_01_sfnt_off0000ec49.bin
19e934dbacb456bd4dd543e38bbe9972a8ba35f1922ce560b95c91524926272b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10736 bytes

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