Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a9e6f65c2442f1…

MALICIOUS

PDF

73.8 KB Created: 2021-10-28 06:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d10160c55c0119ad3f806dc90dafb161 SHA-1: 9980dec5d611f02e88629a343dcc075295ac6b9a SHA-256: 75a9e6f65c2442f1e42e15b5ed924adacb3e8dec76c36e6bc742ddc7a1e38560
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious content or download further payloads. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious purposes. The presence of a link farm heuristic further suggests a tactic to obscure the true destination or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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 https://allytemp.ru/uplcv?utm_term=business+financial+plan+examples PDF link annotation
    • http://queenart.kr/userData/board/file/kipisuvex.pdfIn PDF document text
    • http://e-sheremet.com/img/zowob.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/83861569959.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/7293492290.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/9768265454.pdfIn PDF document text
    • http://abworder.com/uploads/files/motorufesaretonip.pdfIn PDF document text
    • http://sartor.ru/upload/files/nukog.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/duwibivenipomek.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16177895e97f83---wujezazedipefekunuvam.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16168badf9f707---bofawidesasavus.pdfIn PDF document text
    • http://groupkaishan.com/d/files/jasigazujiv.pdfIn PDF document text
    • https://crawfordpoint-ca.seeninherd.com/files/wujilixilomijidapowufev.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wunotulumolij.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/lidakej.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/derulasopamenijogopafaxe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/saveriviki.pdfIn PDF document text
    • https://stvorki.ru/files/file/55293640730.pdfIn PDF document text
    • https://primer-spb.ru/files/files/dunusudesijomapibujomefar.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/12405285618.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/bojibemazon.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/68954446658.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/joxopubogogovoboxalajevi.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/23160434744.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20211023075731059.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/turuxifal.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/45403549186.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_off0000c299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC299 10576 bytes
SHA-256: 97d1947b81747b23858cf2c266117f12825736e830f35d0f20c1a064e153dd53
font_01_sfnt_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 15264 bytes
SHA-256: 19c62de2d5e84c4d858eaca29193c50a0af4230e66361cb7f395cbfd3687a9fd
font_02_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1