Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2e2c6cbcf942f8…

MALICIOUS

PDF

108.4 KB Created: 2021-03-30 09:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 11fb8f3cecdf365782b791bf99c2d7f4 SHA-1: ec032ebc6f8333ad5bc46d2d1f68269ba8679593 SHA-256: 2c2e2c6cbcf942f8e2f23427a854c9d52f85a9087125193e9acee11f502a60b1
186 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 high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or to distribute further malware. The embedded content, though obfuscated, likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=learn+the+i-iv-v-vi+chords PDF link annotation
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/8dd23b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385231/normal_600f23e2d20f0.pdfIn PDF document text
    • https://sarununow.weebly.com/uploads/1/3/4/3/134366188/8755952.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/gxgibIx/mud_bog_trucks_for_sale_in_virginia.pdfIn PDF document text
    • https://cdn.sqhk.co/savadapo/sYibhfJ/bad_piggies_game_download_uptodown.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/botepojale.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/Yiawhiy/89153834402.pdfIn PDF document text
    • https://pupokidam.weebly.com/uploads/1/3/1/3/131381904/2406247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff16dd1e06da.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/R1DiaVH/529783998.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/gilalegipabaman.pdfIn PDF document text
    • https://tiwebusimevadeb.weebly.com/uploads/1/3/5/3/135346158/3616119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496580/normal_60217ad84a00f.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/2285823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_a5a3db467a034a32bcb69258d2349cd3.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_41724867d9964e7f816d987c780a5e02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/6534767903.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/application_form_for_canadian_passport_renewal.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/printer_not_activated_error_code_30_sage_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/vutefeberelamize.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_b624bbf7e9ac4d3196389f71ba7e0a51.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_off000152b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B6 5028 bytes
SHA-256: 1c6d5180169769ce2f08ed0faab2450fa9ac23460c0d1ea3091de048b461fa66
font_01_sfnt_off000163d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D9 13532 bytes
SHA-256: f7e2a119d8c90a76d486ebd6cf9a407ebb5bfe02b158061ba0ff9df5fa1763f3
font_02_sfnt_off00018ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC1 16248 bytes
SHA-256: 3830e9d7039d5fa35c3c3e042a9ac58198e7735bd21e5b8cb7de605257b86314