Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c30527e165fa024…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 14:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91ae27b016e8cd2874a0670220c85be SHA-1: 7a2d4b4b85c4367a1bc48bfd6aad71286d04c520 SHA-256: 0c30527e165fa0244846b26dda57cba8f1cfc8ae92ebd26de59b4e7e3f6eb5a6
156 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 other PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme, likely involving JavaScript for execution.

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://pelibifir.ru/123?utm_term=heat+engine+questions+and+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4453327/normal_601ac5eca691c.pdf
    • http://fuguzelinufi.22web.org/btet_question_paper_2020_download.pdf
    • https://mipadabu.weebly.com/uploads/1/3/4/7/134751654/tubafutuxup.pdf
    • https://detawokigar.weebly.com/uploads/1/3/1/4/131453745/2111272.pdf
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/nunofujiforow.pdf
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5ff9b35302911.pdf
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6030e2786dc37.pdf
    • https://cdn-cms.f-static.net/uploads/4417807/normal_600cf9f0e43c0.pdf
    • https://cdn-cms.f-static.net/uploads/4408321/normal_6017ce0043998.pdf
    • http://sakaxek.mygamesonline.org/wemosijazefobe.pdf
    • https://static.s123-cdn-static.com/uploads/4495244/normal_5fee9d2852632.pdf
    • http://zitosuganenat.medianewsonline.com/60062068717.pdf
    • https://cdn-cms.f-static.net/uploads/4416669/normal_603982909f16d.pdf
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6044915261848.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://musepojomu.rf.gd/nunenusomovigolotifem.pdf
    • http://juxawewoguseku.epizy.com/anaconda_video_songs_ing_telugu.pdf
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_392cb0e512544900ae28b0cb59738f6a.pdf?index=true
    • http://pugavidugipiton.rf.gd/pimimunanojafoda.pdf
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_ed433eb775534e1f91e560f6fc0df023.pdf?index=true
    • http://ruruwuvatokatal.onlinewebshop.net/the_patton_papers.pdf
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_2d70154d6cee40acb6cf9e3a892835f8.pdf?index=true
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_27cbb72278474da3a3f30bb4757b9c77.pdf?index=true
    • 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_off0000f8a2.bin
2744978ffabdd07885d646838e5a8ea9e13fa38426a1ac9359aae82502ed2dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 5356 bytes
font_01_sfnt_off00010af4.bin
664053a31e8da0601d22e4926472db0ee3b05f4b3a029ddde52a0f3fceee0270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 10924 bytes

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