Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e317fcac5dceed6…

MALICIOUS

PDF

89.8 KB Created: 2021-02-23 23:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 69500a9ae88ca01d1420d4846d9382cc SHA-1: 663d61e4ea7cd95732b26d56e29fd451932ae61a SHA-256: 5e317fcac5dceed6772d532f1b0a867ccf46f6dfa681ef9ec307c51478477578
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files, suggesting a link farm or content aggregation strategy. One prominent URL, 'https://jottigo.ru/strik?utm_term=best+book+to+learn+computer+networking', is presented as a search result, indicating a lure. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=best+book+to+learn+computer+networking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369629/normal_602e15505ae51.pdfIn PDF document text
    • https://wemuwenaxi.weebly.com/uploads/1/3/5/2/135298044/kenosofaj_lefixofuv_dedowexije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464052/normal_5fe3bd389b08d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5fdf7b7cc110e.pdfIn PDF document text
    • http://junemam.22web.org/77376372307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_5fd1ccb0ef2e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485451/normal_600587839ebe9.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/nipuxoxotedorise.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/mivetasuvo-zuropoweza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_6024182621929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_603540d3b4fce.pdfIn PDF document text
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/7223686.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5ffd768fd5a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_600c61b7e543f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376849/normal_6003c79684e26.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/ruviwabetine.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/remuv/gojikuwadavun.pdfIn PDF document text
    • http://zebivavube.epizy.com/nowigedal.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/aanandam_malayalam_movie_300mb.pdfIn PDF document text
    • http://vawujularow.rf.gd/dasewabajegebijojoroliw.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe
font_01_sfnt_off0000ffdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDD 5596 bytes
SHA-256: f3fb29aa2a5c6642c9f6ac80b14959ccbc1974e010dbdf7b094fa213d16cca78
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 1872 bytes
SHA-256: 42becf84cfef3af2050d5e7c266acbaeddd1a8cb4cf1814aa6fc565b5bd0bcb8
font_03_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 11608 bytes
SHA-256: 2c2681d70f80b30d8d04c3080e89ca684007cbdab4a0ef13edfc74947e32c56c
font_04_sfnt_off0001434c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434C 16236 bytes
SHA-256: c1e6f7f70e6d37080197135b4b7ca5849484af0fc4ee874c13f106fc96f23b62