Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a428f95ffb5a8fd…

MALICIOUS

PDF

75.4 KB Created: 2021-09-09 01:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 609933e2ae16879cad14c7706afbaffb SHA-1: 256de1b20e528e162aaee6cb73521603279bd545 SHA-256: 0a428f95ffb5a8fdb58130876382fb29dfb2ff62ea17d7ed224f88134564028e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The presence of multiple unknown reputation URLs reinforces the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://8cj2aja7-8mxb.com/contents/files/44190978727.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613608203b2f1---8920461184.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/rakuxozokuzodisevo.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/jedevana.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/36643578028.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/35656476459.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/posigogasemoto.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jukib.pdfIn PDF document text
    • https://camphacement.vn/upload/files/varerulelotokadur.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/20578939662.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kogewuxababiwosaxojawiv.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/9066367120.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/67977500708.pdfIn PDF document text
    • http://landpas.pl/upload/file/58820304995.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/8935820398.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/sonosiwomizenotede.pdfIn PDF document text
    • http://babamoleskine.com/files/file/36075872680.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tawasipogeduxozi.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/nexedun.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/varatatexabef.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/bisifega.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zatoturuxupuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ouvrir+fichier+exe+sur+androidPDF 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_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 10720 bytes
SHA-256: 26feaa151a2ecb5bb747cf399fbf857229de90bc1be88310a56c16c1f6e376fe
font_01_sfnt_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 17976 bytes
SHA-256: e2640d091c7f77b6874a6cac1c7fc4c697ad4fb552e5a6395b5ebe4bbff2a5aa