Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8439183832fe5e3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98dec4141f92a9f74d92e9c20e522cc4 SHA-1: 48f28f2cd14453044183f6eff78255a73a17515c SHA-256: b8439183832fe5e37a40d1624bdbcc595fe4d405ac8fc6310de81b407d0c8d59
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream and numerous external URIs, including one identified as a link farm, strongly suggests the document is designed to lure users to potentially harmful websites. The ML classifier output of 0.995980 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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 http://didopack.com/files/10322619579.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210916102145.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/bimurojigapuranotukile.pdfIn PDF document text
    • https://led7.ru/file/sobafewex.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/jonebigitagupalap.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/pituximisasijokekobesopuk.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/boxukisuzekoxigenalovibe.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/vizijeponisorupevudirid.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lupimipijojujilatesuz.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/53427365727.pdfIn PDF document text
    • http://arucax.am/user_images/file/5482869755.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/23871496091.pdfIn PDF document text
    • http://lobi.md/userfiles/file/zodojezuruf.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/lopejikixaw.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/89294442175.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/xodipava.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/nixalibodifogowovuz.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/34633566425.pdfIn PDF document text
    • http://katela.net/userData/board/file/53136057665.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/79871307852.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210904193221.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/79004138718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rubidium+atomic+radiusPDF 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_off0000d1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 10536 bytes
SHA-256: e134ce8ffb68ad6913cd0a26d80b8cc4d8bfee11f38bcc567fd795e1bbbf74fd
font_02_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 18180 bytes
SHA-256: 5a242b95d3aa7bdb024a80b3d954f4a9647cd5c7048ffa20b0ab643b6282f4bc

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