Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b0616a31fff0ba…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 19:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 837fbf1d3de8ae72bdf5c14906844ca2 SHA-1: 8be34cdd7954a4972df0faa4974cd382a5ce492c SHA-256: b9b0616a31fff0ba774a1846c4e3250f5c4856f28f514fc6bd585330e94e5073
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=connect+galaxy+s7+to+pc', are likely used to redirect users to phishing or malware-hosting sites. The PDF structure and the presence of external URIs suggest an attempt to exploit users through deceptive links, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=connect+galaxy+s7+to+pc PDF link annotation
    • http://shepardinteriordesign.com/rw/upload/file/13677745726.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/rumigedivaradopedapuzo.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/98078878932.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/votejerim.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/gisewavubim.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/46596308193.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/razapoletor.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/26627490168.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fofodenavabuwimijul.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109020103174639.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/jinuno.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/db3c7aea3f92db342f75a56fd11f46ef/86474590420.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/rekifilukazetakujute.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/34273656558.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/57089587652.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/33088708529.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/62107439678.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/bijupamovalin.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/21721383754.pdfIn PDF document text
    • http://agama-rc.com/upload/files/dovalurisavozukuzikir.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/disapuvomupaxipodurap.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/tojusonaru.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/34076856587.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_off0000b13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13F 10656 bytes
SHA-256: 400a643d86edfa54b34e0a7740b59e8e9ff49124911e7f9831a1407335441892
font_01_sfnt_off0000c9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F7 15904 bytes
SHA-256: 5029e915f741f529a994dad37a026eb1bb00f7e6c801dca5fd2d46ed1eaf6908
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1