Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccac4f393e16cd30…

MALICIOUS

PDF

71.0 KB Created: 2021-09-12 18:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d81ee6a69a248650bde2c1d7d49572f6 SHA-1: dea498bfb514a8d09dbaed9fa4672f9b49805922 SHA-256: ccac4f393e16cd30dc0b04c1be326c3a3205c85482c5a21b23121e5dd0b3d053
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with a high-confidence heuristic identifying a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. The presence of embedded URLs and the PDF structure suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://clubesolbra.com/uploads/files/42549058198.pdf In PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/levevutotowubekevo.pdfIn PDF document text
    • https://la-klamm.org/Files/files/newozafuga.pdfIn PDF document text
    • http://generoussecurity.com/uploads/torexifipikepipatamiriwar.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fuwopomeketogesasov.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/gisemuzezegot.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/15355658234.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109090730151600.pdfIn PDF document text
    • http://reichspfarrer.sk/file/40839338973.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jinezamagenuvi.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/47636215334.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613346644de1a---noradurilun.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/famali.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/58665549525.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/romenakagatapixilufogor.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210902230045.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/16333834439.pdfIn PDF document text
    • https://il-gusto.com/images/file/70106435345.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/55416910209.pdfIn PDF document text
    • http://qwerty.pl/_data/file/kufinuzi.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/5949814375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=srikaram+movie+onlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 16804 bytes
SHA-256: a0177df68934c876e995f28c4bd1cc84abc0454e832467d904b957679c047b45
font_02_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 10236 bytes
SHA-256: 8deaf59089974aa4a86a5fea70177aa8f508654435f0192fb88ba89f58d850aa

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