Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed62ab96ee9efb0…

MALICIOUS

PDF

73.7 KB Created: 2021-03-09 12:38:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3cb29c30e0db07e6ccdada082a22ce8 SHA-1: 764238767050f6ff324fd814522db7c674c0ec1c SHA-256: bed62ab96ee9efb033fe52d459a9bd0ad0f2ef245910b4edf4cf9ea8e2366702
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of an SEO spam or phishing campaign aiming to drive traffic to malicious sites. The presence of a download button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and external links point towards a malicious workflow, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/wix?keyword=blitzer+algebra+and+trigonometry+pdf
    • https://static.s123-cdn-static.com/uploads/4423443/normal_60044d295c9f8.pdf
    • https://nobenore.weebly.com/uploads/1/3/2/6/132696051/9481595.pdf
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcb23e1968a4.pdf
    • https://mawubuzepegi.weebly.com/uploads/1/3/3/9/133989242/bimexubufazu-nubetedatazejom-werak-pofobuter.pdf
    • https://static.s123-cdn-static.com/uploads/4394072/normal_60044433d0aaf.pdf
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fe640f5251c5.pdf
    • https://static.s123-cdn-static.com/uploads/4409827/normal_6001d3a22ac8f.pdf
    • https://cdn-cms.f-static.net/uploads/4421205/normal_603f95d83a9bd.pdf
    • https://cdn-cms.f-static.net/uploads/4408721/normal_600e11293d995.pdf
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/533c8aeb6ec6.pdf
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/gelefop_rojir_gilebufopafa.pdf
    • https://lisevududotuwak.weebly.com/uploads/1/3/4/2/134265384/rarid.pdf
    • https://cdn-cms.f-static.net/uploads/4486356/normal_601198aac7aaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wutogugej/what_is_the_value_of_r_constant_in_ideal_gas_law.pdf
    • https://s3.amazonaws.com/jidagafinuxesu/82289335980.pdf
    • https://s3.amazonaws.com/setikizo/hidden_photo_calculator_apk.pdf
    • https://s3.amazonaws.com/titugome/zilezudibivajipe.pdf
    • https://s3.amazonaws.com/jivala/air_conditioning_maintenance_procedures.pdf
    • https://s3.amazonaws.com/gagagakigibapo/play_store_dark_mode_android_pie.pdf
    • https://s3.amazonaws.com/zepifudoxapo/56146335705.pdf
    • https://s3.amazonaws.com/mamukawaxatali/asus_aura_software.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_off0000e2da.bin
25b1f8c233d3671e9642a24b355264c12ef62c746c482c5b2b5f0de395964ec4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 5524 bytes
font_01_sfnt_off0000f5a4.bin
fd568da4f68fccaad7aa8eb2409bd1b5687f934be2ea0cb9c714494f7cf77602
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 10520 bytes