Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e827bf20a534ff8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 03:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2083dc95054ec21e0ee74ca2ef294a84 SHA-1: d2446b4b95d69d4a33a1e7d9e2f525cecf4f4cfa SHA-256: 2e827bf20a534ff85324857360f210c16a0dc49316a0d3dac9ba7edb09a17557
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure point towards an attempt to redirect users to download potentially harmful applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://allytemp.ru/uplcv?utm_term=phoenix+app+download+for+android PDF link annotation
    • https://sankaibearing.com/userfiles/files/69479517979.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/tiludatamojula.pdfIn PDF document text
    • http://popmetre.com/news/files/68818354177.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/zotebiropemifilemenemekil.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d888b43d4---wiwikanawebodidazilemij.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/37023499814.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/wipewodurixunuvido.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/xufemewuxofesezok.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/muzisilixelef.pdfIn PDF document text
    • http://exosushi.com/uploads/files/33527033328.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/sogapotosa.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210910160231.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/57794237302.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/20593870992.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdfIn PDF document text
    • https://labelmarket.pl/data/file/70334511943.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210906143138.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/vogavuluruzixuroduwolez.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/84778114511.pdfIn PDF document text
    • http://epicridesnepal.com/files/7123221282.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/47697890051.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wetazixigolaxejikupe.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/4423691927.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0jc6so8rebpj3rk3rcsoc9mac6/luzotif.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://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_off0000b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78B 10520 bytes
SHA-256: 269301cbe6b917667482ea700cfc2a7f6960527ec697da7609215de2a66700b9
font_01_sfnt_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 16472 bytes
SHA-256: b843fa9f98e8b8dda078648330f33190d7ac88a8392a90a73b78d8d0750d5c2a