Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60ce7a58c6980f1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 17:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c4d1523c4364d2c77779afe78668854 SHA-1: 66237e109d34bf6b21265601cd71b6e3dda06137 SHA-256: a60ce7a58c6980f1b8ebbcbd3483cfcc38ad4240abc3347ae6b414e065dd9b67
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, including one pointing to an IP address, and is identified as a link farm hosted on disposable domains. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=best+space+cleaner+app+for+android PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161411b4c02f00---suzodafasevesugovawim.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/bukulukedifufe.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/zekivemukasob.pdfIn PDF document text
    • http://gibisch.biz/files/files/93609661453.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/52374177146.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/16447219957.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210902_DE317773C60FB634.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/boniluzevepegibukoledade.pdfIn PDF document text
    • https://pepsima.biz/files/file/42538621800.pdfIn PDF document text
    • http://synowka.pl/galeria/file/6025858324.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/45803125314.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/27736018742.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_205551.pdfPDF link annotation
    • http://rld-carbon.ru/file/63660321822.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/lotugomabatoxog.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/tewalujekijivexemidomi.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/34851405615.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/47097803045.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/gopanira.pdfIn PDF document text
    • http://novichiha.ru/pic/file/86707756394.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210903051135.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_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 17940 bytes
SHA-256: 7bb7d13d60e48ecbe6b98b1e09f1b26a6dd32ef5eca4c6426b67bfc4f6beb3e1
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 10668 bytes
SHA-256: e707085b9cf00e1c2be8ab5db63ff2da08234ebff603c946bad6ba88d7f05c40
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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