Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9990844c82dd1d2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8566536c89ca82e25c4b0c75b2dbd665 SHA-1: 67f5d296072b0b2cd86c8f268c4b069997d9f08d SHA-256: c9990844c82dd1d2f6d35525563bfa136b3c41a8c1ae747ecc2141e20be532cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to various domains, with one specifically flagged as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple unknown URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ladangmimpi2.com/contents/files/fudadovenolumiwuroli.pdf In PDF document text
    • http://meditopthailand.com/file/89376120185.pdfIn PDF document text
    • https://5udua.com/contents/files/zaredefobunaz.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/tajifugu.pdfIn PDF document text
    • http://guowangcable.com/d/files/1492293817.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210910_90671.pdfIn PDF document text
    • http://freestyler.cz/img/file/voziwigusaxarodutiditalor.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/buriboxowufo.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/moremerawexuju.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/98072812956.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/29293754067.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/10075995468.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/tarigipiwo.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/fesipasus.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55669889043.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c22085f86---fopozubezakitopumaxogik.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/jaseba.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/78572979593.pdfIn PDF document text
    • http://linza-market.ru/upload/files/mulugivinebososezataxaxuj.pdfIn PDF document text
    • http://enewind.com/pliki/file/dugumubutejeko.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270af88017---3700409192.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/legajeruzofukato.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913030932.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/lolupajona.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/xunebavidepetago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+way+to+facetimePDF 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_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 10500 bytes
SHA-256: aa896d6222124843a0c0be047a40130cfef9dfe3043646789b4dde34a48100e5
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 15448 bytes
SHA-256: be9267fa39ffd08a787fa1102f1dedd163696cd1e857cf2a49e08427b5931c2d

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