Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f42c88e7976a55…

MALICIOUS

PDF

100.0 KB Created: 2021-09-17 20:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 97fe6469940ea7479feef44085ea8609 SHA-1: 08dd1fcce63f2a8b30d666cc46118cd753fa1841 SHA-256: e0f42c88e7976a55217dfef1a137ec52e7b193e5c5cab2dece1198e7ac953def
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of many external URIs strongly suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=lapu+lapu+city+postal+code PDF link annotation
    • http://ms-beauty.com/ckfinder/userfiles/files/jebixuwilemibivujavika.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/nodumulafezorakilotajorab.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/janagufiniponuwotemoj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af71923a6f---7530565844.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/76874418333.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61340cfea30a9.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/29982311571.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/30402408657.pdfIn PDF document text
    • https://edgecs.com/documents/43176459480.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/73033668236.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/52500372092.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909220851.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/38368674103.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109141911291192.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vdju4qsh3vvahajoj6vd3m8qvs/wibapewovuzoze.pdfIn PDF document text
    • https://limsurdua.com/contents/files/zadipulubituna.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/zumejataropaxomupezabupud.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/38103456804.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_26A711FB80987A70.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/benuwinujodomug.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/39534413068.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/rotuwalavanubib.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_off000122d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D5 18308 bytes
SHA-256: 8f022dca6bf4a3321b1df76b66b5049fef6f510ec09231e46df2f87954c19060
font_01_sfnt_off000152e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E6 10472 bytes
SHA-256: 88bca77dac93025c11fc95f5e5ea3eac9e41437609fd238ad952cf92bee08672
font_02_sfnt_off00016ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1