Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95d18ba2a43c594…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6081a0a9db12cf7344ab5cf99f899da SHA-1: a4fedebf2bc33544c258032ac619cbf6b18b81d7 SHA-256: e95d18ba2a43c594167414042e8395d22d2d6283c94a598f1f64660702a60f25
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, many of which point to PDF files on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://dyglas.com/userData/board/file/zuzitovosojawegu.pdf In PDF document text
    • http://saovietgroup.com/upload/FCK/file/womojuzofubogup.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/guveroxugopuromadexefulip.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/7495333402.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/pumeduriwijafom.pdfIn PDF document text
    • http://datcat.vn/2018/file/24136905402.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/velatugofunigizawopuvopu.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7406682405.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/paruri.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/74225013992.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pigam.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xokiko.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/72969359468.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/38353520415.pdfIn PDF document text
    • https://network-italia.com/file/60484616217.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/fetejik.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/44639004606.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/korexizasojonuvelaw.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/93242665886.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/karapesenurudewufegi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a2735b---jisosonolofusonobetupaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=aaad+apk+downloadPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/31293148530.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_off0000dad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD1 9952 bytes
SHA-256: eec6da7f1e76eb9cb65150749e60e6312d96bcc04662e1ada1af84931829f8e2
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 17700 bytes
SHA-256: bf0f4777b484eac23821dc235bde16e1c55300cc43dec19fbee7ac18579612a8

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