Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d4d78ae5e25748…

MALICIOUS

PDF

97.4 KB Created: 2021-09-10 20:42:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae362d6e4ab27956e7c22c52afe5c268 SHA-1: df1ba079f434834e917ee387d58d9dec7af49d80 SHA-256: c7d4d78ae5e257485a4cccf5d3b897c5810ca6f9bfc8db308b7aa77755ab02f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm designed to obscure the true destination or spread malicious content. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d64548356---gizigasulabutiba.pdf In PDF document text
    • http://sirindhorn.net/upload/File/mawoda.pdfIn PDF document text
    • http://semanbio.com/upload/files/jipukosebuderanidurewepi.pdfIn PDF document text
    • http://emannsltd.com/userfiles/suketobolavavovadinem.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/27728344680.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/dimudesaw.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133edba0cdad---5122432139.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/98027572387.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fadik.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/89971226673.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/78203986288.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/92301524825.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/noxone.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/49576635617.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/74296961776.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/45603561042.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/71527092056.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/4930984721.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/varizixotulubipoka.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/jizuditoj.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gefegegazuge.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/saxijefora.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210905_A2AC957CE20CFB8F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=necronomicon+the+wanderings+of+alhazred+pdfPDF 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_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 11188 bytes
SHA-256: 7e3810e61063d4f7ab0b1a31c8da90e6116624bfb4467473cfc26e4def388b2e
font_01_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 18020 bytes
SHA-256: ab264cc3b9085dcb48049bc6dc57fb0019874a950a2cb1f89771015b94deaf6b

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