Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50b13e0c45736f8…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 15:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21246ef31151b3c2e043dfc93c98a9a2 SHA-1: 6ce1ca4782ffa404d89cd242fb6b93a0a85ebe33 SHA-256: d50b13e0c45736f873c4fcbd2b99a5d9621c82f453afc999be01c8a6b9194b11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm or SEO abuse. While no executable scripts were found, the PDF structure and embedded URIs are indicative of a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xy-interior.com/uploads/files/202109091010095256.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614385d38fba8---83126948737.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/86555251744.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/71685177695.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/62332766442.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/kakewa.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tenilosudinewox.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/neremozofokikadozotagurel.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/49766041448.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/damifoduradebodojepuzuf.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/rurovutevupuva.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/joxipurufigawawura.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32807118359.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/34866944170.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/gitepirubopulagago.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50499045005.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/11191201338.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/nobunuma.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gutigukufafu.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/kezezunex.pdfIn PDF document text
    • http://analhospital.net/file/files/jogilodudadujofexojafo.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gukesewujubiw.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109220818458230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+screenshot+on+galaxy+note+10PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/58850e7189717d52c67c6a21d3eb583b/pexuwelebusen.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vametiwezagab.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_off0000b3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CF 10884 bytes
SHA-256: 36cbf771736b01b0f2078dd1022e00945a08ccb0a1d616056d7a4b408de5e901
font_01_sfnt_off0000cd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD14 15592 bytes
SHA-256: 501642b08f5f4cade792b71f716b0caed3e5fe1facd8690adf31999197496c02
font_02_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1