Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a62d26a2f65f29…

MALICIOUS

PDF

80.4 KB Created: 2021-05-23 00:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f62dff990770836c86dab84be2dad10f SHA-1: 5625918bd535e9f4fc5b5926cd07a1dac6282104 SHA-256: 23a62d26a2f65f296fc2242077d97223e31ccf87c4549b831231fa2424b08bd6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on Weebly and appear to be part of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=exercicio+preposi%25C3%25A7%25C3%25A3o+7+ano+com+gabarito PDF link annotation
    • https://dunudodijozu.weebly.com/uploads/1/3/0/8/130813966/6308997.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/jawozipodudo.pdfIn PDF document text
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/481926.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/6576052.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/fifisejixoku_bugemogomakobu.pdfIn PDF document text
    • https://vedifejoroda.weebly.com/uploads/1/3/4/5/134521361/fanitumi_jatixawa_fivulapubu_fobuzisemitom.pdfIn PDF document text
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/78b5d749cdf5c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_60337cc24e825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496582/normal_6014569944630.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/ruzivatef-runevipug-dejibodixa-zomekezi.pdfIn PDF document text
    • https://wewodagib.weebly.com/uploads/1/3/4/2/134266566/xezabusujudubo.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/boleliwonezegof-wuzawug-zujumotebirifuj-riranojebanam.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/natevig.pdfIn PDF document text
    • https://pefuwopiluja.weebly.com/uploads/1/3/4/5/134592541/5881307.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/nojemi/what_does_new_moon_in_sagittarius_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/dell_optiplex_9010_all_in_one_network_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/bhagavad_gita_meaning_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00107386-83a1-4f55-8d3b-cb94e814a0c2/69022160133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6e14c1-5cd8-4988-929a-d75aabc47ffd/anti_deep_freeze_6.62_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/limitation_of_integrated_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd79f9b-9c23-4b89-96f8-0bf44944d99a/how_to_connect_jawbone_speaker_to_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2929058e-c343-4358-9d26-a58b5e17ee31/60784513491.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/50036978430.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_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5968 bytes
SHA-256: f641e78caae6f747d08e360501af5c00714cd7be32938415758b961235bced48
font_01_sfnt_off000108f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F0 13544 bytes
SHA-256: 5e88b04e035e3715276ddbbd3661ebc2c2acf24bfee1109a387bebc595287ff7

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