Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe4181b8b128738…

MALICIOUS

PDF

77.5 KB Created: 2021-09-27 02:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29aa6ec5460f2add94a93aaae38488cb SHA-1: 8893a6d1769bb04837b2e4a661daec5a630488a3 SHA-256: afe4181b8b12873829f8868684ec654ccb0eecf0aa7ff813eb26dc9ce5ea6082
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external URIs. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the numerous suspicious URLs found in the document, which are characteristic of phishing or malware distribution campaigns. The document's structure and the high number of links point towards a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=boku+no+hero+academia+movie+free PDF link annotation
    • https://terlickodds.cz/www/www/fckphotos/file/zewip.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/85864632620.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/31847718506.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/pubem.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/rabemofuxikejipaxuvobif.pdfIn PDF document text
    • https://isleo.com/i_photos/file/53254375653.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/16151544308.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/79784119320.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/14257695260.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/9475572674.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/56747716111.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/midojelerexivatupo.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/61205545213.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/4527272094.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lodikiwurafonapekizuxa.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/lafebanulokigezufovoj.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/51466813701.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/45079188172.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/61481954753a9.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kumebe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e3c705cdb1795ee0a0997fc450b3410/repemelagubil.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/voziripufadejujizovurore.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/70803168280.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142393c803e5---fakepajudanow.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/35368419623.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26E 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_01_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 18108 bytes
SHA-256: ddf75aec40643d6bf2b168b778200f20307f3166dcd48f889edce91f829f617d
font_03_sfnt_off00010ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECB 10740 bytes
SHA-256: 509e99b012b6ccd6201d5af7bc266330d66db4416c1a0fb455d7313f7d9a122b

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