Malicious PDF — malware analysis report

Static analysis result for SHA-256 b262c6bbd7fa801b…

MALICIOUS

PDF

79.1 KB Created: 2021-06-04 02:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 928caaad85a0ae344b0a736da5aeec62 SHA-1: 4d3bc15b4da46de5da83468052d8d3c397aab065 SHA-256: b262c6bbd7fa801b9ba707bd49e04e52cc3537c524e575282e22641cf0f7f2ba
156 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, with the primary URL being a lure for users interested in barley tea. The presence of numerous PDF links, including one pointing to 'refarumiba.pbworks.com', indicates a potential attempt to distribute further malicious content or engage in phishing activities.

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://ketchas.ru/pbw?utm_term=how+to+make+barley+tea
    • https://tivubikujadilav.weebly.com/uploads/1/3/4/5/134527100/revopumunabubuj_govaju.pdf
    • https://nixozetite.weebly.com/uploads/1/3/0/8/130873825/9b445fe6a3ff4.pdf
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/439683.pdf
    • https://pupisisewovafon.weebly.com/uploads/1/3/4/5/134500239/ketajosile.pdf
    • https://rajawanog.weebly.com/uploads/1/3/5/3/135320481/a43625.pdf
    • https://static.s123-cdn-static-d.com/uploads/4390329/normal_60b1f6e149b7d.pdf
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/1644588.pdf
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/5726229.pdf
    • https://jonowukamox.weebly.com/uploads/1/3/4/3/134372820/7bbd20db25b.pdf
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/2112426.pdf
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/4887874.pdf
    • https://cdn-cms.f-static.net/uploads/4477138/normal_60599d2d11958.pdf
    • https://cdn-cms.f-static.net/uploads/4444370/normal_604519c0e21b4.pdf
    • https://tudaxuvogune.weebly.com/uploads/1/3/6/0/136082380/9430998.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://refarumiba.pbworks.com/f/derojumapenav.pdf
    • http://rorazokazog.pbworks.com/f/18210350008.pdf
    • https://uploads.strikinglycdn.com/files/8af6e5d8-38b8-493c-b79f-5af9472c9286/6x9_speaker_cutting_template.pdf
    • https://uploads.strikinglycdn.com/files/b4d963d4-ef5a-4e26-83b4-d68212a38648/rikarewumeta.pdf
    • https://uploads.strikinglycdn.com/files/794d89b2-830d-477b-b300-fc9418305861/gilunofodugetegenakufu.pdf
    • http://savavaze.pbworks.com/f/gupulerekanetetusox.pdf
    • http://pajinap.pbworks.com/w/file/fetch/144500178/hotarubi_no_mori_e_english_sub_free_download.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_off0000f520.bin
29aa7b36ea0b295d329e69d4592f3627132b76fe4b7b61522ba16c6dbb3bc5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 5012 bytes
font_01_sfnt_off0001062a.bin
5fae345305f6d223b1563af10517a684fbdc22ced2c5320a2e1ed0730f542ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 11888 bytes

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