Malicious PDF — malware analysis report

Static analysis result for SHA-256 037a4936cb58a8f3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 03:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 41e9403d19a40f66d80f286f52417a2a SHA-1: edd901119a7f6b7274b2a52fb3dd7f11441cb3be SHA-256: 037a4936cb58a8f3040a3c19a26822ad1152df61f8cd49822ea1f22a69333539
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=resident+evil+degeneration+apk+download PDF link annotation
    • http://leylasuren.com/images/userfiles/imagefile/84785266462.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/524c23a5a3e8cd5971bda6f82a1b417f/dagakidaluliduruvaxapo.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wovezokivegefa.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/favugitiwe.pdfIn PDF document text
    • http://thevale.us/userimages/zodujuri.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/zaxorulukikulokaxagu.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/xetikogutodetutekeje.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/detivalunafoloruz.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/pibasi.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/bovowun.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/43598038194.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/buzuxezodonakexugimu.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/jijejilabolasapenowaj.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/laliziridatujebosotexoke.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/53619751456.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910143820132.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/xomazore.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/25449012566.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/jekivujuwijesowu.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/6005755730.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/rumefodoxusuzovenur.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/fanovadudenuv.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/sifutonitafu.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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 17300 bytes
SHA-256: 070d3025669a2ff4d088f4a5373d16bdd9df7a74c5322200c91d85f2ff7c48b8
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 10856 bytes
SHA-256: 367d0fe3d8e721166acc2c43492925d3bf6d0e6f28d67c17f10b62e4ab963719