Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2ebde32038b06…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 11:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6567366c0afe8e5dcfbd170198f3c880 SHA-1: d2d8d9b1d1125b9a2b6a4f076b6f075e48a4ba7d SHA-256: 90a2ebde32038b06e7a2d56c3def717673810eae04f4389ae1b590f515d6ac5a
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 external URIs, many of which are embedded within the document body and point to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dongcohonda.com/userfiles/file/21880729663.pdf In PDF document text
    • https://vanvoorst.info/uploaded/file/75304432160.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/1763132429.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/gijipum.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/gotajovavami.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/35776214299.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/bexulovafedal.pdfIn PDF document text
    • http://svx.su/ffile/file/34707280755.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210919054717758450.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/5553488218.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/75937774163.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/geferenozorevex.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/55622091151.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/57692280809.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/ramagodalodakimudajegi.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/18100139573.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/pudusex.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/wajavexonifewi.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/62783576310.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/36025703739.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/bumigumalavuvidurevenanan.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/0fbb1739e95a9538f2b7d34145ccc005/9185399693.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zewibikujunivakoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=lite+star+mod+apk+unlimited+timePDF 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_off0000c33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 10700 bytes
SHA-256: 98e54ebb19a20ef4aae134ed06878ffecaac5acaf69d4f457b19a6ac01107815
font_02_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 17564 bytes
SHA-256: 4d46b6f4adac27415d54c8c87be3bcb704247becec346e5f8cdd66ae0cd01893