Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc734cdb1e46ce0e…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 00:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ce9f2eac14696b039f1aa8cf5428c8b1 SHA-1: 17862e2b1d84e2f879ee180d1d9dd26f6408ea47 SHA-256: dc734cdb1e46ce0e6d485e7cfac6f7f7bb7cf3efb0227999c8723e0920842deb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://tivicom.vn/upload/files/bifasawibonaxoxidapo.pdf In PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/241822967.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109161319067095.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/sazud.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/75438867188.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/64235312526.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/93393387240.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/pabekun.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/narenononilewugali.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/92706991385.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/39332160019.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiwop.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/65574499486.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/33947605571.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/tozematufomosuguvitif.pdfIn PDF document text
    • http://www.ventisilva.com.br/ckfinder/userfiles/files/23791498275.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/19981426387.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/99952461086.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13670958788.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/nosejudesufonedupugexor.pdfIn PDF document text
    • https://bunianco.com/other_files/File/biwugukuvilalenanavabuva.pdfIn PDF document text
    • http://specialcats.nl/media/files/danugiganixuwikotubi.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/tepovavekigugo.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/96552364467.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/kugetidupipezutemifuwaxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=jurassic+park+full+movie+in+englishPDF 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_off0000e36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 18452 bytes
SHA-256: 453aa35bdc1b2fa9eaabaea33c7b4762746792a5408ca5bb3d5a14bfbc3cd7f8
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 11080 bytes
SHA-256: 62fea8b012a8145a4b2a246003bb76d703e01e9b79748d5965d89ff3600d0c0e