Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebc184feb284227…

MALICIOUS

PDF

72.5 KB Created: 2021-10-01 12:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7f64f3faeca6cb104c56dd6385f28e70 SHA-1: 3e6d750c1587c0aa9b8ae287da3622faaf338a4f SHA-256: 6ebc184feb2842272a7a7386bac3476e35cec15923c90d96c399b345ea480d96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic indicates it's a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 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 http://resumesfromabove.com/userfiles/file/xajixawaxuxevowaxupozus.pdf In PDF document text
    • https://ccenter.ro/userfiles/files/nulamibapolexuxe.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/78550950435.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/55072517222.pdfIn PDF document text
    • http://julianina.de/upload/file/5960568721.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/rupavawu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/54340489366.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/95404648829.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/51b2beeeeceddda187d0cc9d75c82b18/kasutusemusilujew.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/kedazuvisuwedi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/27431818206.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/vapifimaso.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/kafepudoregogobudubuxan.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jixofiwezazupod.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/76328395398.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/27170003499.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/fiwatibatezufaf.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/25496026713.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/265840c5d80ed67fe1552e1ba7c5784e/89372226342.pdfIn PDF document text
    • http://osayit.com/images/file/51566649084.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/21689164619.pdfIn PDF document text
    • https://miet.hu/kepek/wanaxidizavikiwebu.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210906104556_7pugig.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/15744674897.pdfIn PDF document text
    • http://ashioke.com/images/library/File/87143393466.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/29980192998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=movie+maker+free+download+greekPDF link annotation
    • 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://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_off0000b68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68C 16988 bytes
SHA-256: d106fa6a927a9c0981d99003186fa5b514f74dc24ce11063013feafe538e4761
font_01_sfnt_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 10668 bytes
SHA-256: 38c1d263f343eef2659342a7d80daf78b9686a74b6b071d9997b4c4ec92db282
font_02_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1