Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8cb026a1f178bc…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 23:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16dd2157eae7689dcc236a9ef6700785 SHA-1: a1ce93ff3bab53adc378be8599f440a25e28f2c6 SHA-256: 8b8cb026a1f178bcb3efe2c46b5f661339b6e8f867083e2705f940a2ccc9cc32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, with one heuristic identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61750647660.pdf In PDF document text
    • https://polenhosting.com/calisma2/files/uploads/35145745826.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/wunokoxoboxidowuxax.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/99063271436.pdfIn PDF document text
    • http://zamgph.com/uploads/file/2014552454.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/lixibofefugu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/81280321641.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/pibijesikukejunup.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109081702468273.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/rotir.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/2740677402.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/50797554256.pdfIn PDF document text
    • http://aa-nusd.jp/xoramulubutamoragive.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/jabutifebuponakewemirim.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/10197963999.pdfIn PDF document text
    • http://geose.ru/userfiles/file/dujip.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/viretep.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210914113028.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/zudoromawidojenutazimuwu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b59e51e0a---pexijopemupudosixinit.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/sulobibikasewop.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/45264805236.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/99332175914.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/31144239993.pdfIn PDF document text
    • https://nomortiga.com/contents/files/dodigazirulokijol.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/97247281974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=football+manager+2021+apk+downloadPDF 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_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 18664 bytes
SHA-256: aa6a69de5070619af32ee545ce9d9abf6a944dcc9834edc079e3e9a5cd4fdf9b
font_01_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 11064 bytes
SHA-256: f9f92aa35b685440a4589e2cf09d128933ba20963bd8d502e543ea30abeca336

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