Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5193f8ce22a1f0b…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 20:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e72c26fdcbb34b1de2ea1e19a22d6f51 SHA-1: 231f424729c4354b678da657e8987e8beb43d8c0 SHA-256: d5193f8ce22a1f0ba568b22c974a7f9cd63c1aba4d123ba4b1eba252976cedb7
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF documents. One of the primary external URIs, 'https://baarspo.ru/aws?utm_term=nccn+guidelines+version+4.+2018+multiple+myeloma', suggests a lure related to medical guidelines to entice users to click. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://baarspo.ru/aws?utm_term=nccn+guidelines+version+4.+2018+multiple+myeloma PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372735/normal_6023f83b257fd.pdfIn PDF document text
    • https://donedupefunesu.weebly.com/uploads/1/3/1/6/131607777/xiropoxojaxip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452171/normal_6005536e2fb07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_601c8713b5b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391921/normal_5ff7dcca4966f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fca04520ed66.pdfIn PDF document text
    • https://kofutisidizeb.weebly.com/uploads/1/3/1/4/131437743/2677074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fe06dfa2f3ba.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/liziso_rotomurilaremem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/pusiro.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/42174924912.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/bridgman_man.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/9490587811.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/howrah_bridge_1958_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/naphtha_reforming_reaction.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 6164 bytes
SHA-256: 036df387cf93245fe5d236c0d0c0582df8e0cc59d7e778cb8129b6d89dd1ab0b
font_01_sfnt_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 9936 bytes
SHA-256: 7a4f4184795321f4d81b09c2bb3e6ce765fcabe3b8c556c197ee24dac97a1afa

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