Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaf9fbbb999d6fe…

MALICIOUS

PDF

89.4 KB Created: 2021-09-14 08:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2593e855193d72d335c652a6e0d19dc5 SHA-1: 8199144d457259cbf5ae156980e99b45fc0195ee SHA-256: daaf9fbbb999d6fe9a35d9a7b0b098659cb687bb17843b13e87fa036ed30b96f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a likely attempt to distribute malicious or spam content. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of suspicious URLs suggests a phishing or spam distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • 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://romanakladatelstvi.cz/userfiles/file/firewojixa.pdf In PDF document text
    • http://lavalnerina.com/userfiles/file/ziwose.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/roxuxowazubonenu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/piwikupexunun.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/wiwulexetawebim.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/tixolamu.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/jenatugunapubepamaridub.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909232606.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/munanunukivakon.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigubefo.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wemebude.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/82198337641.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/48766819444.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/80040611539.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/58723180944.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b277e8eb---86375418404.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613640e7e0555---jupunifujuxegef.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/34606483523.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/99105955282.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/65874004575.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///fisibanatinakiga.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/6482865861.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demumavolunabolibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+change+resolution+of+app+in+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010d9d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D9D 18224 bytes
SHA-256: 6d69ea9bf8aa0eb80339800658b4e20c5d1f398d386bb86906749210806d6ff7
font_00_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 11076 bytes
SHA-256: 95ffa1f530323a8573a884cdbae5a2d7beb6590af01afa2f6dbd10f17926c399
font_01_sfnt_off0000f58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EA 17516 bytes
SHA-256: c3497738730b9e9ae5f7552b2355d5468c4dc2096645ee7ef78ddf8b83a0787f

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