Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b8daebe27e0376…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 22:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b22f7a89061aecc8141e053a6415dd2 SHA-1: 4e6fd83d178df3f303d734cbbc67969b8179afa6 SHA-256: 95b8daebe27e03769c3e17c3ba19bf37f0f05acc30ce5c1e6967125e8c64d042
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. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://w-w.cn/isee/pfm/cms/uploadfile/fck/file/35191682351.pdf In PDF document text
    • http://ktcz.eu/files/files/tesudowinogegekizog.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/juvinana.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/8957114694.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/gotuvetavoligawepanane.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/92623999228.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///15558686837.pdfIn PDF document text
    • http://dakov.hu/_user/file/zalufawipezixuseleminuve.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/soserotawupagitufegil.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jirowejemalobipixogejen.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/75957600695.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/kitevexero.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/woxidupirilenozepekuxuwe.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/13210883147.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pabasos.pdfIn PDF document text
    • http://asqcert.net/files/files/95824027993.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/95447480311.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/niburo.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/14463092291.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/kugijasuvutovizun.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/gezofopedob.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/dadizetukejuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=three+and+four+letter+wordsPDF 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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10508 bytes
SHA-256: d26c51a422574497179e12b5122d3392f8e83418c379c052116d76d4b2f587bf
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 18624 bytes
SHA-256: 459a1ac190fe5518b8ce7703b6576778dcc766e729ed73f2274e10079bf1f1d2

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