Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c8213fc7aa50ef…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 01:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa6a84165fdf5ab9aa5b6660dd27c4e SHA-1: ecf8e690424b3d06e48c5c61edd112688cfa05f8 SHA-256: f1c8213fc7aa50ef5a21fa614a8de5f943eed16cdf5a2eeea3cc9e8934842550
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which appear to be part of a link farm hosted on disposable domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=gis+in+land+use+planning PDF link annotation
    • http://naturalwonders.com/uploads/files/guleziburukupugozo.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fupimaxeva.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/236811378.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/dotevamodijererodo.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/votapilafovowalogofubil.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/61279118743.pdfIn PDF document text
    • http://innersolutions-uk.com/file/nobebagojibibepo.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/36679842377.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xewilu.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/soxazegaratebiliviwuju.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/59156875558.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/58168541037.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/seduvizufufewegejizavofe.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613514d7a5e75.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/13837377958.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/rugeraxe.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/51119137473.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a967edd1---49040256254.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613864a0e6c03---fimipexumowafijufotiro.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/duxatejapiwene.pdfIn PDF document text
    • http://cloverdiamond.com/file/nudevisukekukozifitot.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630958605.pdfIn PDF document text
    • https://cet.sk/res/file/pozozidawevenutinemosugaj.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_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 17776 bytes
SHA-256: f01c51ed3fb9d2036ca7dbb53c39f5282b8699a003cf38a06468ba5571e63ba4
font_01_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 10388 bytes
SHA-256: 6d093b8f97f80d5d77c8b54756fe54b8072772acfe31bd5ddf144f3c63dee322

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