Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df59797f4d74824…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 17:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d16c9a2041161a99afe58277ee95ab54 SHA-1: 9fecb2b1874f4ae5d2cc13236742c9952ad38c39 SHA-256: 8df59797f4d748243ffea9d50a51961e51a8e9ab261bb1981ef3aad3c4a26143
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=download+bomber+friends+apk PDF link annotation
    • http://kangshi-you.com/uploads/files/202109072043054184.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/86557089740.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/17550822879.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-5/20210905173847740764.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/89044537167.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/98763970658.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210904194624.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecf4c22f3---74727092484.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jadevakibapox.pdfIn PDF document text
    • http://186086.com/upload/files/fexer.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0b742a42---bebisilibitoreginalikubo.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/bewedapetanodus.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/80708232841.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/29883418336.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/tivufikenavun.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/46371704665.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/14254772053.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/mebotozoxukesabedofofad.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/46845122728.pdfIn PDF document text
    • https://hsse.cl/files/dilasovuwanogorizipek.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14966623196.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/78870113345.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/13207668795.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2l5fuusrlvfhvit4r0ehcmgehh/15086087183.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/77842045549.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 16944 bytes
SHA-256: d43ae0b2ad83106d4e987e6324970546c4837e7eb341b376cbaa6e15981b8c77
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10880 bytes
SHA-256: b16c017b4dfa49829cb59ee4dcb02c8b00034e0d4ab3a690680b75596a604087
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1