Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c330bacfc84d6c1…

MALICIOUS

PDF

86.8 KB Created: 2021-09-14 09:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9254c33a0630b02a4b7d06060d291ccd SHA-1: 6c90165d9dfa07f5cf638396f7da61c61f802a8d SHA-256: 7c330bacfc84d6c1d8a803d05c7f9b0380ad937024b9188e2a6ae5619211d991
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It utilizes multiple URLs, including a link farm, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and the 'Pdf.Phishing.Trojan' detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://chongros.com/userData/board/file/fimez.pdf In PDF document text
    • https://erdenetpost.mn/userfiles/files/rezozipisujulatorip.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/wutafebegu.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/nixopomugilebinoxis.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/2723587308.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/piwojebez.pdfIn PDF document text
    • http://fullx.net/files/gozolarezexuxujobi.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/63075738617.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/gewuxebemepamivobu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/38118072196.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/welidilevatajidiv.pdfIn PDF document text
    • http://52963566.com/upload/file/202109101100203085.pdfIn PDF document text
    • https://granitnet.hu/editor_up/20796298725.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/70052463488.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/bubezepimiw.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/vekipebekexekawebedasedo.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/79444855162.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/basibuwuwo.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/77054216515.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/96592501846.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/33319314181.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/64275410531.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/26737759918.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/95516990108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+gmail+hacker+apk+androidPDF 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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 10876 bytes
SHA-256: db30ca0f8f98e258278d3c53b0e94dc8a6cf3abc428ef1a81c471e079f7a3685
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 18344 bytes
SHA-256: 551f7b7065c050cbd6218ef6dd25696d2fff11c14689e69d327dff76566fcffc

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