Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8317eae3769cf5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 20:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48db264c6cc0b8d51620d8327675a3e8 SHA-1: aa19b0de1842fd73c8ffc7d0d95d7ca2531e7e85 SHA-256: cd8317eae3769cf5fc446c868c5a95d1cb99157e65edd8b933556838b6af7cd6
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 pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are characteristic of a link farm used to obscure the final destination, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://cuuhoatudong.com/upload/files/6974052298.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/25043153736.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/wuvunexakuledaz.pdfIn PDF document text
    • http://dsfly.com/uploads/files/38966058703.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/ruwujumexinisezoraba.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/67732528458.pdfIn PDF document text
    • https://interconformity.ro/images/file/70263346948.pdfIn PDF document text
    • http://espokebar.com/uploads/files/wexomumizudalulekubaf.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/27540682535.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/64836833521.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109040851141587.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/52727947295.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/49787690116.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/97566018027.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/tokpv2k4suuftg4qf8oanahsd3/gizemotivunebalemijonufa.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/78665510262.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/32238742065.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/nopozi.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/bobosiweba.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210909092225.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/lafek.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/wivogazurabimi.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/sutasesasuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dual+app+apk+pro+downloadPDF 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_off0000da20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA20 18252 bytes
SHA-256: ddff7a05fcf0c1f485c8b2a85cc73b2c306da936b4bf3e4ae8b3a3e80cf4f639
font_01_sfnt_off00010904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 10172 bytes
SHA-256: ff245b51c720357221e97914e845486836fdd4265fcbf0cb12668250ce1ca353

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