Malicious PDF — malware analysis report

Static analysis result for SHA-256 1278a7591c786d7f…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 00:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48453981a575c70cd21cba03471abebf SHA-1: 9b4843c590474094e92c007022f23665cb4d3f76 SHA-256: 1278a7591c786d7f70639b2529a40c42ff084d86ce4e49dc34b8cdb15cc262ec
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, with a high-confidence heuristic identifying it as a link farm on disposable hosting. One specific link, http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/rigukog.pdf, is flagged as a potentially malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://mobiliteit.nu/files/lenabimugij.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/65525332028.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/nalaj.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908171158.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/logupimapi.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///rudefekarifa.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/rigukog.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/88056147962.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/pevaluredizibawepuvarurug.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210915_428FCCB5CAB1D331.pdfIn PDF document text
    • https://parfumzone.ro/files/file/tusem.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/b6f7b369997e3f6e1926f00402b7dde6/29030884906.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sulorewewajazegugixixib.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210924223134.pdfIn PDF document text
    • http://kasand.com/userfiles/retubejaberifogodaberi.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/lixiwilefizuxatixasasat.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/e4f1481e9cd93c5ec7c5bbe526edf06e/12768289389.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/kawilakavevakosadakewaxak.pdfIn PDF document text
    • http://laserinnsbruck.com/static/25194580913.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/96074081152.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/gutekatizivobesa.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/rexesitaxedi.pdfIn PDF document text
    • http://www.pilartangguh.com/file/7707483872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=apps+from+android+to+iphonePDF 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_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 19048 bytes
SHA-256: 9febd63ac65c024587b7c6d2ba07a997f766ea6ad714543ef183980ca7d342eb
font_01_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 10700 bytes
SHA-256: fe6455c2330950ad5ac1eb7781f4525b3ec3ca42f6b006eb30d817a550df18e8