Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a6588a40de2121…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 22:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 501787cbb409aa3b3baaacae8a222fa3 SHA-1: 63da009364e5a0a0e40f51101053cb02603666fa SHA-256: a2a6588a40de21210f81563e407efcd17a48962f5178238cd3c11e8ca1dd3dcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on disposable domains, one of which is disguised as a Minecraft APK download. This suggests a social engineering tactic to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://starma.pl/files/file/32258762013.pdf In PDF document text
    • https://orangcar.com/app/webroot/upload/files/tevidupikizuju.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140fdf531100---lazijidowimibekokafexu.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/27035723551.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/51818908035.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/8117563222.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/gamudad.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p7pn6qc9i5koo2adb24gqjiofu/xivekuroferilib.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/65540659377.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/81060849485.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/79179447519.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/guwamojuzu.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163073596915a2c2fe6d12bdc21e16.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/73268262469.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/69350694261.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614778f731da7---gibababepawuzawonuk.pdfIn PDF document text
    • http://bdnchem.com/upload/files/kilizodawofujafil.pdfIn PDF document text
    • https://777mto.com/contents/files/dakusiwiramigoz.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/girebasasitabesakimovak.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/53998196980.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bemano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+apk+download+pocket+editionPDF 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_off0000baa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA2 16004 bytes
SHA-256: 26af3d1b8b88614709383af3e976f4b1f8d2b8cfe4c881ce1b0b405702d2b6c8
font_01_sfnt_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10616 bytes
SHA-256: 9bf09cbd092be3ea5fcda68da2b9fed200d86e89d04d920149d47e6d1fb1cca6

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