Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b4a3329fd1eb24…

MALICIOUS

PDF

93.6 KB Created: 2021-05-01 03:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca70dca10bf05da936a377ff85aefc8b SHA-1: 2d64c3a7b9bb435a8c34aad43a599ac3489e7618 SHA-256: b2b4a3329fd1eb24c965e26571c90f10c84303c04cc20cadac923748a02be9f2
156 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 of which point to potentially malicious or SEO-spam related content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=types+of+research+report+format
    • https://cdn.sqhk.co/nojedevatas/gj3TTgd/texas_longhorns_black_and_white_clipart.pdf
    • https://cdn.sqhk.co/vigefifobot/hfibg6M/46290125931.pdf
    • https://wirosumarot.weebly.com/uploads/1/3/1/3/131398493/1a671c7dd9f7a7.pdf
    • https://cdn.sqhk.co/jemowevu/94iCSRM/wukixoser.pdf
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/229a040d2ed2.pdf
    • https://gukabezifom.weebly.com/uploads/1/3/6/0/136051166/1787615.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd0d3e43991f.pdf
    • https://cdn-cms.f-static.net/uploads/4375197/normal_60505bec317fa.pdf
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/3920724.pdf
    • https://cdn.sqhk.co/ruzaxube/iiigRhh/76513574586.pdf
    • https://cdn.sqhk.co/masunidupag/ajdhdoi/38384107025.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/napoledunadigo/cdcr_title_15.pdf
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_89d7bacb42524bd08c6e4d55b0528763.pdf?index=true
    • https://s3.amazonaws.com/dabatisew/18123202829.pdf
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_cab2097f15504805963a55bed1a82e96.pdf?index=true
    • https://s3.amazonaws.com/pisik/sonomusol.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_eeb857c0c93a48be93d94c9a0603fa03.pdf?index=true
    • https://s3.amazonaws.com/pipaneku/bubedilo.pdf
    • https://s3.amazonaws.com/podawakumepewez/27375255588.pdf
    • https://s3.amazonaws.com/vavale/vukemojagegesa.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_off00013296.bin
5cd5dbf8cda42357cd44812b9bdaa69c36a0898a00a08312bf99fff98c01f771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 5272 bytes
font_01_sfnt_off00014464.bin
bebf0234771f9ef494f0d0d5fad319fd7977cc940f7b49e3e5ad7238aae8830b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14464 10960 bytes

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