Malicious PDF — malware analysis report

Static analysis result for SHA-256 251bbae68eecdef0…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 10:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2da5b35d4c928322faa988c3775fce9f SHA-1: 3975df1152e0b967d85290073845ece1f18d85ba SHA-256: 251bbae68eecdef0290ccd7cbfba89d7461850976e5520cde7aac5e6f0105021
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://peusch.lu/userfiles/files/vuxiwajefulomotijilotus.pdf In PDF document text
    • https://yarpaket.ru/userfiles/file/75796700465.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/giratam.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d16655348---78104216572.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/vexevitisesogorok.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/butizuxegaxatixem.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/jejowipobonibi.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/xexizezelojetegaxejetapes.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/63125793957.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/87676066062.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/438952620.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/zatone.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/39874003310.pdfIn PDF document text
    • https://hoongnau.com/upload/files/41213173824.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/pitalisuzuteki.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/tuziwemelozi.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/lomilegekezodomumiw.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/polakujepog.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/rezewekamakapiwexafo.pdfIn PDF document text
    • http://weldingplaza.com/files/file/67856207048.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/muwas.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/neburinewakepawebavuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=index+of+the+big+bang+theory+season+8PDF 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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 18592 bytes
SHA-256: dd6d053a4e965957444c28edb7d3128c58695d0227ace211252419b3cc922b26
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 11100 bytes
SHA-256: d03c43ae58c2092789d24861557c50c2fcbfb78cdf738d9033e1819e778f8196
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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