Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba06c5e72c1ce1f9…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 08:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 96a2ea0c4dc8a561089e174a1bc8ba2f SHA-1: a203803a619a4b59091f9493c426e97e12deef3f SHA-256: ba06c5e72c1ce1f99b07a04e4cf9cee4bbb95f784f3f38f076e1f01375b8e909
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to PDF files, suggesting a link farm or phishing campaign. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support a malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=is+qa+tester+a+good+career PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ff7135b68092.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/e10566a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_6022bd8edb17f.pdfIn PDF document text
    • http://spoonnumberone.xyz/lemevo9xze6.pdfIn PDF document text
    • http://premiumpornclips.com/97029321791m1li6.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/180682.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/48e9d37f.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/90b1b0dfd1c5.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/e3f23e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_5fe7b606521f6.pdfIn PDF document text
    • https://nipixajivoru.weebly.com/uploads/1/3/1/4/131436983/4948150.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/zomuzigo/zugediziv.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/nezasi.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/72433900794.pdfIn PDF document text
    • http://tijiwef.epizy.com/idle_poring_guide_knight.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/lake_michigan_fishing_report_wi_dnr.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/paxapakesegimajo.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/aerodynamics_for_engineering_students_6th_edition.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/10198096258.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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 5136 bytes
SHA-256: ccf78958d88ee33eda0437c02ce07d2a095397c006acbdc7151bb4f5c46ad9c8
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 11488 bytes
SHA-256: e337a731294f998201dc5386175028cc402fb460bd88ccc35c3eee70edfb9546

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