Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eeaaa0a058bf257…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 14:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70ff81cef29db78505bcff2959d80774 SHA-1: ede6249e5def69d1c5e7c8821c3e4a35c290015b SHA-256: 9eeaaa0a058bf25722eb8b605dd67d22f745779c139a806d054765fc82266e3a
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm on disposable hosting, with numerous distinct URLs pointing to potentially malicious content. The presence of external URIs and the link farm behavior strongly suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://yao-cheng.com/uploadfiles/20210907060632.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb05cecaff---gitijexopewa.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/79051655832.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/72320236766.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/gasadoxiwugotalafazigoj.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/zedutarazamepa.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/nanovovazakigalexevi.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/fatujarifozexiwe.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/fuzezesebodexojudiga.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/tefogokifubi.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/dezasasimofapumi.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/70415739280.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lemowevodoganusuno.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/junusesefokiwileba.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eedf8dc710---pekepukaxuwumatutabekoge.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/kafilagimejip.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/getomefilikoxokino.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/denopisigufekovu.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/vusezunesivovawuvegavi.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/dumemowadugubifefu.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/35586315102.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nigakodab.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/gonofiduti.pdfIn PDF document text
    • https://digireg.pl/upload/14493260774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=f1+mobile+apk+modPDF 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_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 10344 bytes
SHA-256: 773cbe1ab77ac6e184d7435af12ca553f7e4982d3bde7c93e74539de2194837e
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 19944 bytes
SHA-256: d2c0392f03da3f618b1fbe12953844ab344225bad0e1e548a9ad52dc357d4bd6
font_02_sfnt_off0001087e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1