Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8758588676155a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45dea065a30cbef73fc762f85e83d550 SHA-1: b01637a3883707272bacbde23ffab46933861a4c SHA-256: 9d8758588676155a3815e4cb8728a889bbbbe26321c4145688c47ed3cd325b63
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an intent to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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=ejercicios+de+pensamiento+analitico+exani+ii+pdf PDF link annotation
    • http://laptopcuhaiphong.vn/upload/files/51672082799.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/sozawibazidop.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mixekelep.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a18d6383ec6cb6734a36aef329c1b25c/kigipubinobozini.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/83638136928.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/kugofinulenemibareposovu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/78898207168.pdfIn PDF document text
    • http://gojjang.com/uploads/files/vumulanerutip.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/nivurubaxofu.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/91798203300.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210917_55587C840A226D2D.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/42339219242.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/vexezejot.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/95894133932.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210909154427706.pdfIn PDF document text
    • http://hiniceshine.com/upload/93230641085.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/roxazozobepematedep.pdfIn PDF document text
    • https://activepymes.com/pub/file/13951006140.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/7791316797.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/25711855718.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gamefokofevodusipunur.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/lazizixut.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/17378896500.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10996 bytes
SHA-256: 52bb8888fcaab589fcc353cd7b808e15f813184648f9070f833c431fc62a31f4
font_01_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 19980 bytes
SHA-256: 50ea65f4ddbd76a3d2cd3bbaad59cf82698423835e9748e8d1119e5742bc10d8

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