Malicious PDF — malware analysis report

Static analysis result for SHA-256 d431bd2de45e7518…

MALICIOUS

PDF

94.4 KB Created: 2021-09-09 12:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55fb611cb89dd1c2cdffd7ae34834e25 SHA-1: 876f4d98ff31f1a5d43fe5a7fcc27b718cdbf459 SHA-256: d431bd2de45e7518c99571b0a01d6e63580ac5596565e0203efb7252839a7449
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a large number of embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 5

  • 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.
  • 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://phucatgarment.com.vn/ckfinder/userfiles/files/27963864371.pdf In PDF document text
    • http://newabel.com/ckfinder/userfiles/files/46566162.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/tovifi.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/50970198233.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/54947427671.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/61879362708.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/68372030536.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/jimubujigegopowepokali.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/66117285909.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044180cb7c---81861166657.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/1552841469.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/sujixupodefanepojesu.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/kabavajigofubuturevetetif.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210908232819.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/nosipegubofagupeped.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/vebiguwipuxaxexinosat.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/91473774674.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/46727098450.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357c2641963---xinuxavowigubipafewov.pdfIn PDF document text
    • http://calisnt.com/uploads/files/36462988146.pdfIn PDF document text
    • http://sun-eko.eu/files/file/sijalisilekirijevomezapu.pdfIn PDF document text
    • http://hijoin.hu/editor_up/mufijupozakotufazok.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/2465427251.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/lufuzejilisovomukilixeze.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909061732_562389841.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/92516396965.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/30592742160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dr+driving+2+mod+apk+all+cars+unlockedPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16348 bytes
SHA-256: 8fcced7a8fcbf22d45689b44407ce1c1b45b78050135da208b7eeea4fc129b0d
font_01_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 11140 bytes
SHA-256: fd125dbc04a7cd023847cb6f6b34fae7b2b1f956f3a011df353be133781705c6
font_03_sfnt_off000131bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BD 21780 bytes
SHA-256: 61aafd6d0c79ce02f53c751a244f3ddbefa32819be8192fb82e329020761595e