Malicious PDF — malware analysis report

Static analysis result for SHA-256 017dfdac0de0c71d…

MALICIOUS

PDF

87.9 KB Created: 2021-10-06 17:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9a7201f397b4bef99352e8fbde2a9583 SHA-1: 33c8296171dd438a2b3d030f893f2279675249d4 SHA-256: 017dfdac0de0c71d16f9de756cb6baf8cdc803b34cc8e4da791740f07958fda3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://forssah.co/userfiles/file/53224191048.pdf In PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/2091461425.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/99505554524.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/wovoligogigefimoxewagot.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/26110294992.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xoxirat.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/22965941582.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16158a94628f60---wirewuxumalujitasa.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/70443623302.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/75063373394.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/78453162983.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/37455976568.pdfIn PDF document text
    • http://ilkemymm.com/image/files/45124153271.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/zadoxulaxivadedojekunozu.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/7523820512.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76056133800.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/17455957970.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/nanenalabasubepogidopama.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/35090304306.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/1778504877.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/89044381349.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/51926594545.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/84582129919.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/82986026260.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/92979566645.pdfIn PDF document text
    • http://turnyras.lt/Files/file/jopepovulupokudobidavaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scones+from+scratchPDF 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_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 20040 bytes
SHA-256: 1cbed29b27304465f7e8954fa0a1e73f201e7baaca39ba0a81e149e4d7378397
font_02_sfnt_off000139cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CC 10540 bytes
SHA-256: 959fe9ec48855d7a6dc5f12b583089313495fda9fbbc50ae6386f4bad80384e1