Malicious PDF — malware analysis report

Static analysis result for SHA-256 8838907a8aabfc6d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 23:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 908bed664ccc3e64a5e483893d730cf6 SHA-1: e25bcaac8c260063ac9d0d26a536546f944ad861 SHA-256: 8838907a8aabfc6d1b7f52186cf93421703beaf723dae15898261327f7eaf911
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm with numerous distinct hosts and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to redirect users to malicious content. While no scripts were directly extracted, the overall structure and heuristic firings suggest this PDF is part of a phishing campaign designed to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://uniroll.pl/user_images/file/gamunamoxur.pdf In PDF document text
    • http://robfredo.com/userfiles/file/zovavifegugimedo.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bitisazavet.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/260e10b6447d0b1254313d2bc2a1638e/43647572794.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/dirunis.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/96785660929.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/2812176376.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/pujafa.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/xikixa.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/77746996601.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210906034307_1431837300.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/76472814061.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/1074521577.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///58803105658.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/belafimusijadififunenes.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6f520ead---78821985809.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/85431889082.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/nokukefezif.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/neligajene.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/pezemorife.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wogivasawoxawaxedol.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/tifezenewesefarugokutejob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=dream+league+soccer+unlimited+coinPDF 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_off0000b2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E6 10812 bytes
SHA-256: a47065dfe00bf86eb88e7a82982fefdd058391351c3307761d9a1043b9e16de5
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 15516 bytes
SHA-256: c485754ff2658555b0f7ca8698e88717d6528d5564b98943d23c6960e86243cb

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