Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a7f8791a54fa98…

MALICIOUS

PDF

83.7 KB Created: 2021-10-06 01:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e0c07fe3a9b3ab68ad51485603eb6e86 SHA-1: 4ced17aa0fffcd3e74f49fd701edd5d2cff92609 SHA-256: 73a7f8791a54fa98b81fff206f5544a6da80b15368d709dabcdf733b69f3e331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pixomot.ru/uplcv?utm_term=most+to+least+reactive+metals PDF link annotation
    • http://norilskgu.ru/userfiles/file/marawakonawofifezus.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/lewalevokozozomuvugaz.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/230102156231.pdfIn PDF document text
    • http://wjcopy.com/upload/files/sibiwisafun.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/55143056687.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/rovorukosube.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/vuseviw.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/zifafiboge.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/28061004954.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/8760773442.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/rusulupeviregavexi.pdfIn PDF document text
    • https://ysh.my/userfiles/file/64733161730.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/52618853366.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/72067456567.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/zukedej.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/vavekeriletavuke.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/38205660526.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/pobulasogotuzudozof.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/49097028317.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zoxidepawarabotuxilowonum.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9832453e---sefadudatalogib.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/60463045413.pdfIn PDF document text
    • 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_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10348 bytes
SHA-256: b692d4c9002e87b1da3e921530bd49692a877c5f08227bfbfe34a9d7cebd5d09
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 19552 bytes
SHA-256: b48538fe5e57baea9bf15dc2471d408bb540bdd56734d0df261a3390bfaeccf0
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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