Malicious PDF — malware analysis report

Static analysis result for SHA-256 1742a72d5240e69b…

MALICIOUS

PDF

71.7 KB Created: 2021-10-07 17:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70df5956ad988e87076c73c0f86c4efa SHA-1: b44cb4936517cc0e2a7620e108916c8127c6e4c8 SHA-256: 1742a72d5240e69bcc2c3779dff89e94a1ea077ebbbc2695bd7e3c8410fd03b2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external, potentially malicious websites, consistent with a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, further supporting the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/uplcv?utm_term=how+to+answer+your+greatest+accomplishment PDF link annotation
    • http://zhihepvb.com/upload/ckimg/files/202109270247416854.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/99799318056.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/962035876.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/38598491601.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20211005112544.pdfIn PDF document text
    • http://smogy.ru/files/files/1716977155.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-13/20210913200029186307.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/62798717811.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/lunusuzena.pdfIn PDF document text
    • http://labotinnghia.com/img/files/bopixokuvador.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/92940200460.pdfIn PDF document text
    • http://land89.com/ckupload/files/37493437991.pdfIn PDF document text
    • http://simoncaulkin.com/images/bafezifokalitanododunef.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/70127778561449de6b9251.pdfIn PDF document text
    • https://brakos.it/file/68643565902.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1d07646f---zaluranitifif.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-28-10-28-47-38.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/sogebasalowoxivajewes.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/49784414767.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/8349071312.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/50601972391.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zozawojovixenozagidorepa.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202110021630452416.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_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 11112 bytes
SHA-256: 8e4cd1a3adea7e7a8b27fcae34f73417a40d6861f4a6c211124e8524626428f5
font_01_sfnt_off0000d20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20B 15492 bytes
SHA-256: bc738b35f25c2e989bcccfde76aead4f005a5b03ef5c1a9e39fec9a8587c205f
font_02_sfnt_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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