Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcd0ca3c322ab0f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 08:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ebf0844e787c627cb1d426e8aebb9eb7 SHA-1: 3dcaf1d60a23df05ffee54cb7fb5d85658017767 SHA-256: ebcd0ca3c322ab0f708098cc8b26e23e1dbfc5d840ba525be2413f72a3f6b645
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://hsdinstruments.nl/uploads/files/vujixetaduma.pdf In PDF document text
    • http://olgapolyakova.com/files/files/19334366974.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/fojafozolupitud.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/a70134bb01116b258f30494a4865dd29.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/47224523395.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/mepotoxafokifanijiz.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/davadoxiwe.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c40aada26---90320083587.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/rorirovafazazil.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/69737980732.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/50353884836.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bafuzemose.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/36340055865.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/52701972401.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffbcb39cfb---fosidix.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/19025424150.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/94007845473.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/61642305834.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/71371735465.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/tasanejevofuxi.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/pegoxutozimetigojovovozaj.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/woluzewizawuvexipufalul.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/sadagobozojifuzabebo.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/83885947452.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/10419060040.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/kekakeka1631074653.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/88597727513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=frp+bypass+lock+apkPDF 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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 10264 bytes
SHA-256: 98baabd9ecbcf63361938eddf0874d8945d6a53cbd14414c14b11771507b6080
font_01_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 15996 bytes
SHA-256: f328e5ed0a5cebaa59388664d05a30ce0f932f0931abae53da1989989de4827f
font_02_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1