Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b967fee18cee71…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 18:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8291cb9dfe7350e6dc3f59f71623a6be SHA-1: 0d8831057c333a98df325f7d04960b3795141cb0 SHA-256: e0b967fee18cee714241119e6c7bd03b71fd2dd5a367de88deed3becc59c3a9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term_redirector=True' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it's likely used to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hoigolfbinhthuan.com/users/files/pukoxasezivizo.pdf In PDF document text
    • http://indianspringhomes.com/userfiles/files/kadeborido.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/towaf.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/lubarotofawedabag.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/71189854694.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902165630.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/69838377092.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/bizuxakuxaketo.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/vavimamudeziwodekatutuvep.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/84024784897.pdfIn PDF document text
    • http://dejede.com/userfiles/file/fimin.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/waburijazi.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/32984260292.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/29885791333.pdfIn PDF document text
    • http://vit-physio.de/file/ditisepa.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-3/20210903103344909285.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210910_000039.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/46689933851.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/34936631799.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/47764807768.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zuzogopawedikapisog.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/63593498844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=planes+live+mod+apkPDF 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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 19904 bytes
SHA-256: 7e29786ea396f6ff818e95c8f0ca7298d980a79b87c8551652d3a84624b2bc55
font_01_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C4 10512 bytes
SHA-256: 0cc9d795612f8b32156c6eb97eda33930e37d8f3dd7fb2ba9ecf689fc3c1c835

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