Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbcb2525154c13b…

MALICIOUS

PDF

77.6 KB Created: 2021-04-26 06:35:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06538b6da8304ea85e5ffd1c80a3efa0 SHA-1: 27dd65a99b526feb57f4a25980d827dfbb4f7e77 SHA-256: cbbcb2525154c13be92356797edcf94edad2c5dc75749240ec1a529a20e769c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=words+every+first+grader+should+know
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/vagolojofa-malos-wifipawuzub-limedo.pdf
    • https://cdn.sqhk.co/gabironero/hi2JGbK/77561367687.pdf
    • https://zotikukubufo.weebly.com/uploads/1/3/4/7/134773644/f11dc9a.pdf
    • http://options.expert/60692179011n7evm.pdf
    • http://freshka.fun/zatolepmr92.pdf
    • https://cdn.sqhk.co/zoxogatuv/8QibQwV/6376239132.pdf
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/vazevugimi.pdf
    • http://myfavoritesun.xyz/monosaccharide_disaccharide_polysaccharideggbi0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zibenoroduzuw/38301853180.pdf
    • https://uploads.strikinglycdn.com/files/97182707-b46f-4f70-9d7c-fddd8f77fbc1/what_does_4e_mean_on_a_samsung_washer.pdf
    • https://uploads.strikinglycdn.com/files/a021f9ac-4a5a-4a4f-94ba-1ae4d139f10f/fuwoxiv.pdf
    • https://s3.amazonaws.com/miledu/86275536617.pdf
    • https://s3.amazonaws.com/gixirojozogufux/plantronics_explorer_505_specs.pdf
    • https://s3.amazonaws.com/vufuzewasi/cheminformatics_jobs_in_hyderabad.pdf
    • https://s3.amazonaws.com/tolivajupeku/tesibegofizesaxovusezusov.pdf
    • https://s3.amazonaws.com/rakabexozu/what_does_it_mean_to_be_in_charge_of_someones_bag.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_off0000f267.bin
1b3aa87c165cf1f6cf29afe7a617a660d7472b256e5c7a470c323b85e56770b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5500 bytes
font_01_sfnt_off00010535.bin
2713b8b5e54774d1308ab14191519095a3553ef4d9cb7c1fd61bc37c44bfc320
pdf-font-stream PDF embedded font (sfnt) at offset 0x10535 10688 bytes