Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aee00cf99204c63…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e33367966570a2341cc69828e98ee209 SHA-1: d14a14adf4bcd4e8f78531604757829c6e75845c SHA-256: 1aee00cf99204c638b5194a31870c3bf2c05ad9dc9dd7bde9ca4ac01db56320b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=android+jelly+bean+virtualbox PDF link annotation
    • http://bolt-go77.com/fckeditor/userfiles/file/11143972530.pdfIn PDF document text
    • http://happy-land.hu/editor_up/67091054989.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/gegotemiwenex.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/22886349084.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/folaxoketefetijuletawipez.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/zimevekovebiruno.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5d3b7cf9---74588844755.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/78368919828.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/mokepibuwutosos.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/belatedaw.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/miwasilavi.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/bolusisogunogore.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/18467132575.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613757fb5a46a---78030509656.pdfIn PDF document text
    • http://elsped.hu/files/file/8508218389.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/26274155670.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tezozibujito.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/pemot.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/55730358472.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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 19456 bytes
SHA-256: 79d4f90dd48fa7ff69cf6c2eeb147d2d86141ca27cf54fb93ce690f1701c1087
font_01_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 10708 bytes
SHA-256: 10088547f60fca316b9fca9e3dbf902ff886d3a0a5dace460d99d219b4c3dd00
font_02_sfnt_off00012485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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