Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be71d496ae18ab0…

MALICIOUS

PDF

79.4 KB Created: 2021-03-14 23:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d0dc4a0e7be3a2e1fa77030acd3d5a1 SHA-1: 5d473fe74f2d8da0737c565bb6423c08b94b802e SHA-256: 4be71d496ae18ab0c195e26552fde30317e898b2d9a98e8fa51155b6c1449921
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 pointing to PDF files, suggesting a link farm or SEO poisoning attempt. The primary URL, https://soxebez.ru/wix?keyword=sql+must+declare+the+scalar+variable+date, is likely a lure to a phishing or malware distribution site. ClamAV and ML heuristics confirm the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=sql+must+declare+the+scalar+variable+date
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/60126a.pdf
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/fagesuradozu.pdf
    • https://kosodakugup.weebly.com/uploads/1/3/4/6/134655388/3673882.pdf
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/ronapusivenimumaber.pdf
    • https://porilijure.weebly.com/uploads/1/3/1/6/131606314/7121645.pdf
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/wusudumirufidag.pdf
    • https://kuxorife.weebly.com/uploads/1/3/5/3/135313812/lutofemozexixige.pdf
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/pozilesajave.pdf
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/nixebazefekapi.pdf
    • http://joritirumag.mypressonline.com/nasigagupenejenupi.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/83f40f230e529.pdf
    • http://pasiworuwiwoz.getenjoyment.net/81750896067.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jofatifexotuba.rf.gd/my_favorite_things_stamps_canada.pdf
    • https://s3.amazonaws.com/divelatoxa/how_do_you_tighten_a_grohe_kitchen_faucet.pdf
    • http://luvabokinoleg.onlinewebshop.net/tokikidin.pdf
    • https://s3.amazonaws.com/nafamaragisek/exercices_corrigs_sur_les_bascules_rs.pdf
    • https://s3.amazonaws.com/pulavokaxe/82063049824.pdf
    • https://s3.amazonaws.com/jezobasit/portfolio_front_page_template.pdf
    • https://s3.amazonaws.com/fedure/anticoagulant_therapy.pdf
    • http://dulasugemekiv.epizy.com/apa_reference_government_report_with_author.pdf
    • http://nawezurik.rf.gd/think_central_science_fusion_grade_7.pdf
    • http://sogivuwe.onlinewebshop.net/17463713515.pdf
    • https://s3.amazonaws.com/tazopaju/suxikiritire.pdf
    • https://s3.amazonaws.com/legipalofi/43398144807.pdf
    • http://gegenig.epizy.com/34618111368.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_off0000f682.bin
699d9c0833478c28eee748d0ad26abbf6900a762e898ab8d8a7757dff2930111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 5608 bytes
font_01_sfnt_off0001096e.bin
7a0d50d903559efcb7357dadc8dbd29b9b4c26f26154e958b9fe89a67df7a518		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096E 11220 bytes

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