Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a4e12b5876a2b6…

MALICIOUS

PDF

88.7 KB Created: 2021-03-01 01:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6e60e809857db52216554c2737f4abe8 SHA-1: cffe03f7c91d1fa99bcf6deb5f65f132a90eb4aa SHA-256: a5a4e12b5876a2b6f7d4378069dc668763c38e219c68fde090b7290b6e8b497d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are generated to appear as SEO-friendly content, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/wix?keyword=der+richter+und+sein+henker+fragen+pdf PDF link annotation
    • https://cdn.sqhk.co/pavetikedur/ciexjcp/vezokadamax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_6007ff9e95c13.pdfIn PDF document text
    • https://galewijukinez.weebly.com/uploads/1/3/2/6/132695540/xifetepuzigu-vixigol.pdfIn PDF document text
    • https://kaxudafesin.weebly.com/uploads/1/3/4/3/134355678/gufureb_xopafom_lomif_dawixaguzatave.pdfIn PDF document text
    • http://everydays.space/loruzozev1vfcg.pdfIn PDF document text
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/35bf5d05bde.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/xotemevenitineb.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/Gidjgii/the_cw_app_free_download.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/1386074.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/mepixafob_wenizo.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/ThhqjbO/juwujesotuweruzaxe.pdfIn PDF document text
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/6207253.pdfIn PDF document text
    • http://bridgecommerce.com/fronius_eco_27._0-_3-_s_datasheetpp1t3.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/vabedafozo/pivude.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/process_flow_diagram_ppt_template.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/php_file_from_ajax_request.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/business_information_systems_course.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_off00011db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB4 5448 bytes
SHA-256: ee187ace35e8687c767a0df65349957068a062accd59daa7f7d78674bf25826f
font_01_sfnt_off00013042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 11352 bytes
SHA-256: 0155fd368ff298e6d2b9c9c8def5e2119c94147949a7602167221725089ab7c1

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