Malicious PDF — malware analysis report

Static analysis result for SHA-256 58260d2eb9b145e2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 01:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fa79ecf830145838b18b12b45311d43 SHA-1: 821697f249425cc93b81285be934f9b630ea83f0 SHA-256: 58260d2eb9b145e2ea7660f28a80d4a47bb63cb7aae3221e009649da4a138553
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and contains embedded JavaScript, indicating a malicious intent to execute code. Several heuristics point to the document being part of a link farm hosted on disposable domains, with one direct link to an IP address, suggesting it's used for phishing or distributing further malware. The presence of embedded JS and external links strongly suggests an attempt to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64776796593.pdf
    • http://i-physiology.ru/upload/lukinanetetegefaxevoxo.pdf
    • http://kleinschadenexpert.com/userfiles/file/87728812213.pdf
    • http://garageanything.com/js/upload/files/46113426952.pdf
    • http://oshcongregation.com/userfiles/file/93034110041.pdf
    • http://rockefellersgold.hu/editor_up/21652349623.pdf
    • http://ausafe.net/images/art/files/dumipolelinamanivawes.pdf
    • http://aburobocon2019.mnb.mn/uploads/files/tofexow.pdf
    • https://officialbacknumber.org/editor_up/rivovaka.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/36204877727.pdf
    • http://185.33.116.145/~acus01/upload/files/viganifamoxarajuzirud.pdf
    • https://akproauto.com/nbloom/fckuploads/file/daxijazus.pdf
    • https://aquaprosmart.com/userfiles/files/99424369254.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/47760300198.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/96607420179.pdf
    • http://venusland.vn/app/webroot/img/files/28705888685.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/kuwuk.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45227348052.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/mumudirigufurapatipisig.pdf
    • http://agnieszkapawlik.com/userfiles/file/kuvudobo.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/gewimebav.pdf
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/29656831766.pdf
    • https://konchris.com/userfiles/file/1630871772.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320fc968c5a---15412167629.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=american+horror+story+asylum+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 16792 bytes
font_01_sfnt_off0000eefc.bin
96ffa7a6303efbbda3e3c193503bc7feba04898d8614c806a5796d77160feab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 18000 bytes
font_02_sfnt_off00011d89.bin
ff69c7a45ce57e6672d49a71434ad0ad91ca7d7b6b29f5225393e7e0c0fa07f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 11100 bytes

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