Malicious PDF — malware analysis report

Static analysis result for SHA-256 4275e8f700d96c09…

MALICIOUS

PDF

71.1 KB Created: 2021-10-01 14:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 97e85a868f3d01bad47e79566afb96ce SHA-1: c8b060e5a2b1f1ec7d338e23b62a393e6630d08a SHA-256: 4275e8f700d96c095835f2861a2b56358f1013f1fcbee2467868c3acb9ad3127
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic firings indicate it's a link farm on disposable hosting, directing users to external URLs. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+do+i+put+my+contacts+back+on+my+phone PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc916605f0---suxomopugilulefutu.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/90908940156.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kepesazifanibikene.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/tovepaxosabujame.pdfIn PDF document text
    • http://popeyebio.com/upload/files/kopoxuzimukip.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/42603870980.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/13598046629.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/1886642227.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/womurazojuta.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a3ca8f448---70883426685.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/bedoziduwixununuj.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/luxuxuleperusigafoz.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/90569537099.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/25062418951.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/vupevosatamejokabif.pdfIn PDF document text
    • https://ttablaksystem.hu/files/file/80052014400.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/tiwat.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/57385199754.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/worojesuxakojaluvokexop.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16323351671547810183.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/rigovuse.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vezozonopitinalup.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/milenenexozubufilor.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bitolanutatalaja.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/7625789377.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_off0000b533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 15472 bytes
SHA-256: ff3b0182ae9f375eb52d11828bb78f951d35f024a2e7ec695d2167e3e27fbadd
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 11156 bytes
SHA-256: 95c9921a4b2f6182d85794f486d3ed98725bffdccbc7257573ced9bf80406908