Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43cccc4bdf553e2…

MALICIOUS

PDF

85.9 KB Created: 2021-04-02 12:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7663771c3924492352b758cc8d383dc4 SHA-1: d27fa5d29e9659cdb890e90b366ee4c156c71966 SHA-256: c43cccc4bdf553e26bcd8b0c8b03d85d0cc5256fc45c4bdf9056fdd09ea14e06
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, suggesting a tactic to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to lead users to external content, possibly for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=what+does+enthalpy+of+solution+mean PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ff6bdb7a5bc9.pdfIn PDF document text
    • http://50offit.pro/financial_report_orangemc4kp.pdfIn PDF document text
    • http://nipijimosobolem.mypressonline.com/bmi_calculator_kg_cm_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460228/normal_5fefdd18eebf9.pdfIn PDF document text
    • http://ita-talia.fun/omron_plc_software_pricezylw6.pdfIn PDF document text
    • http://letnesil.xyz/wakisufmiqsx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366397/normal_5fff7f8bcacc9.pdfIn PDF document text
    • http://ru-1.casa/96441115753z8jx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_6047d06cec090.pdfIn PDF document text
    • http://cartest.pro/75448673164duij1.pdfIn PDF document text
    • http://shimano-stradic.ru/prefix_and_suffix_worksheets_for_5th_grade4vhy3.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/41675527672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426409/normal_6000e6b8d34ee.pdfIn PDF document text
    • http://reduslim-officialsite.site/436160774614wbre.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/the_secret_rhonda_byrne_quotes_tumblr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445864/normal_60036c8410103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501367/normal_5fe0b7a09cd8e.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/68574297678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepetixapokurob.myartsonline.com/7630065891.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_ec14a20bc0de483d9da1cd37ffc9e0ab.pdf?index=trueIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_86c17313e6bb4520b9e2535f6fc7249f.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_488d6fca4f7f40feb7aa390a6eeccddf.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 5300 bytes
SHA-256: 2b7f01e9f38ca5a31e5c5827c98a8ea259a5c1dc05275b40dcb68f1d1cc5f5b1
font_01_sfnt_off00010af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF6 12500 bytes
SHA-256: bbae771f26f279ca4d35e6e1146cfb3aad2306d257a080aa80d9894d28756c02
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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