Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9dd85d648efd4d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 21:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 91c52431ba36668da3445383c27ca2f8 SHA-1: fd8f0d3fd71433b049b42e8876659618d8078594 SHA-256: ad9dd85d648efd4d89f235371da67087782d17cae679a6bb79d9ba6907cb56da
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-severity heuristic indicating it's a link farm on disposable hosting. One link, http://lucidareemantenerepavimentifaidate.it/userfiles/files/jogubagulumimazazokepife.pdf, is algorithmically generated, suggesting a malicious intent to direct users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://alnahamgroup.com/userfiles/file/fudewokeg.pdf In PDF document text
    • http://hanmih.com/userfiles/file/20210915172139.pdfIn PDF document text
    • https://jobtiara.com/files/files/62239489375.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/97513996371.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/jogubagulumimazazokepife.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109010953487773.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/40690109792.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/32497496147.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/nopasuked.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/96813225479.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36522732123.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/44082187567.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/15888764973.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/3580073522.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/18707216923.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86462347061.pdfIn PDF document text
    • http://bienbao.org/uploads/files/7201063128.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090520471173499.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/wolanogorilirumusip.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/ruxuboropulaforov.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupunu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419adb30471---42235423175.pdfIn PDF document text
    • http://abworder.com/uploads/files/vawisijukopejumufawagi.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/31603609742.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/fd5cd0e06b657952ce02579dd7ef2e1b/takorigopodedulopod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=365+days+english+subtitles+online+streamingPDF 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_off0000d830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD830 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 11424 bytes
SHA-256: df3871f43c4bd03be4e4455378ba4a585432423eb2535911c40fdde46b6a2510