Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e987e47869c10b…

MALICIOUS

PDF

75.3 KB Created: 2021-04-17 14:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c760582a4c98550cc6ef200b1531b191 SHA-1: 42f67a1c21e145ba84bc8c842d22d09893c54a04 SHA-256: 24e987e47869c10b3ca84ab75e0b5671d1b878a5c85dfa0895fc516496038656
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous external URLs, with one specifically noted as a link farm on disposable hosting, suggesting a tactic to obscure the final malicious destination. The PDF structure and embedded content, though partially obfuscated, point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/strik?utm_term=is+enthalpy+change+of+atomisation+always+negative PDF link annotation
    • https://zeloseko.weebly.com/uploads/1/3/1/1/131163733/4706820.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/61173238047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_60384cc474f08.pdfIn PDF document text
    • https://rixajijinuroje.weebly.com/uploads/1/3/4/4/134473879/de9fbaa31d0d237.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/lajawageteruvedemojabifeb.pdfIn PDF document text
    • http://ludesajezopaju.medianewsonline.com/16425788453.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/67230710739.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/acetaminophen_mechanism_of_action.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476756/normal_5ff9ea877f4d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5fd15bedd26c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/vodume.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_43311b1c1a27458e8fffcf48d15bdaa5.pdf?index=trueIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_26f57bf9dba44a0ba82e6ed3260672f7.pdf?index=trueIn PDF document text
    • http://zewadomi.myartsonline.com/merchant_of_venice_short_summary_act_1.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/bestway_cement_annual_report_2020.pdfIn PDF document text
    • http://jujobope.atwebpages.com/dazat.pdfIn PDF document text
    • http://kexomun.myartsonline.com/kitekofusasovoje.pdfIn PDF document text
    • http://fazobelo.onlinewebshop.net/livro_amplificadores_de_udio.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_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 5524 bytes
SHA-256: b21993bdb8c0bb04288d3a03359c3fdfad2560584898a565f942fe08952ba6f7
font_01_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 11368 bytes
SHA-256: 2b1ca5367a5359f27c1d63c8930684b0d8b1c0a9c65fb2cdf99478d8db4f8c60

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