Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c0c7a89afe094a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 00:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53c2d9a88d89f51429397c29cb18ac74 SHA-1: d8b64c14b8422c6abde866bfad27a5e7b624bd51 SHA-256: 49c0c7a89afe094a89fe893433e470fcfc0f35ad6cef7792fb36953b42979353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lidaoxc.com/upload/files/jubugevupedinajupij.pdf In PDF document text
    • http://shiny-baby.com/fileimage/file/pegogazu.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/63370565526.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/firazojiritetapel.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161425f014f24f---3538967509.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/4869768448.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31200916027.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/xinosetirusexusevog.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/52636321.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/86047716239.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/64803632924.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/podal.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/10560678656.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/kasogunisinekozarogago.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/934452c3a31d5c6996d4310932444bd2/badizugisusi.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/sakinajekomujux.pdfIn PDF document text
    • http://ymmicro.com/files/files/90054171997.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/zawuraganodowume.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090418080027.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jotobidakixi.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/wuwaleguwuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=redmi+9+power+call+recordingPDF 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55F 10888 bytes
SHA-256: 5a3ca3f27b2777729a752f4b4d9f2adfca97b29e1ac8202eb633ea18a71a0487
font_02_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 18880 bytes
SHA-256: ab67ad9d9f19578365ba1f4320fdc25da2db639306ea3de3792351d972313bcf

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