Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a451d59985212bb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-10 18:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c93ad82bb29f249d9eaa38e5f15131d5 SHA-1: 7b21402f9af151e043aff5231f42d7d90d3d1474 SHA-256: 8a451d59985212bb51296d81c77689fcf143ddb2772a5ebe04373e77f845025c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://netwindowvn.com/uploads/userfiles/file/2958674966.pdf In PDF document text
    • http://geasit.it/userfiles/files/rerebazisunabeworumipid.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/samuvodasasigiluk.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/wesamajelesogazidojepa.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/wonezegipexuvetuvu.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/dezeko.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/915785817.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/gefalenetozodanodepakatos.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/dubadod.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/webuvezukozobuxupaxekom.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109070509594586.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/41445527455.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/85478839963.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/fenatuzi.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/82543777849.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mebibimetoxunotonavakajol.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/17110343340.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f051dc44---96563935580.pdfIn PDF document text
    • http://uteambio.com/upload/files/84727122621.pdfIn PDF document text
    • https://digireg.nz/upload/ninomawonoxovegigalin.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/88729807231.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/wibuvosejo.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/vinivipu.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/sepobojobazuwogomisura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=network+books+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_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 18900 bytes
SHA-256: 74d4abd6cd5f1c0f703e595a107ec2bfdc239d5020c7362e4813b3dc02a1c520
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 10384 bytes
SHA-256: 80a53c86257e6237e8ef9513255640e0ac3f830148cc0360fa0ae3c68387aa32
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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