Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f89b4d2ebea4712…

MALICIOUS

PDF

73.5 KB Created: 2021-03-12 05:57:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c057821209e925e5d54701dd408c4344 SHA-1: a80cef9c01fc6efac856203b140283e581fdf512 SHA-256: 9f89b4d2ebea4712e317dd39b0d95f8791cc68eef16c4d75d65c0e5d098218db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing lure disguised as a worksheet. No scripts were extracted, but the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=work+and+power+problems+worksheet+with+answers PDF link annotation
    • https://tebemixaziwig.weebly.com/uploads/1/3/4/8/134889210/begak_sadipibefurake_namejibozujot_kuketod.pdfIn PDF document text
    • https://varovugunigode.weebly.com/uploads/1/3/4/4/134480676/zepufizoniladi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fc8dec938609.pdfIn PDF document text
    • https://zifaxigelu.weebly.com/uploads/1/3/4/7/134720210/sifivibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_600d5054f1672.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/c7b2df72174d4b.pdfIn PDF document text
    • http://pidawiwosoda.iblogger.org/continuous_cursive_handwriting_worksheets_uk.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/9598897.pdfIn PDF document text
    • http://dasonudulikuvon.22web.org/tosawazitefegalikorelag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_602e36c97880a.pdfIn PDF document text
    • https://lugelobixo.weebly.com/uploads/1/3/6/0/136095506/bojigorukowuja-vibuzipakofogop-bolese.pdfIn PDF document text
    • http://nenusarawamis.22web.org/what_does_._mean_in_mathematica.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/rizijubovapuk/konozitu.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/delivery_challan_template_in_excel_free.pdfIn PDF document text
    • http://xerekexaxo.epizy.com/86899342048.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/67278859654.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/speed_queen_washing_machine_repairs_johannesburg.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/gapivogij.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/pezopumofudo.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/86988105612.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/criminal_background_check_form.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_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 5508 bytes
SHA-256: 4c7a7c8ac993227a2b3c3c84f9c6f06194afb255909cb2423f1c7e019e9ebdf8
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 10236 bytes
SHA-256: fe10dd999c7e017df45882fe61e796628e756affe0eaf097b769ba078b514e81

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