Malicious PDF — malware analysis report

Static analysis result for SHA-256 d70ad870b64f9f08…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 06:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cce790388ed053ae4c0cd3a55a186de SHA-1: 8ecc5176bfd8b9c473e0816896d9092bf49ac99b SHA-256: d70ad870b64f9f08006fdf085c242ac6a774e8a7fbb79ba86c3d550b723615b7
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm. The ML classifier strongly indicated maliciousness. The presence of external URIs and the link farm structure suggest this document is intended to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://synerhu.ru/uplcv?utm_term=sensors+in+android+phone PDF link annotation
    • https://longhoang.vn/upload/files/gizaligugitopagutum.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/susuxefomitogojiniduta.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bidukememu.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/74209169842.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/jilisazupevowusazanedugi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kipeminariwusutufekamat.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/veteg.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///29457181905.pdfIn PDF document text
    • http://salkim.com/userfiles/file/riwijorimukibimuvogobi.pdfIn PDF document text
    • http://flexa.cz/docs/file/buxuwik.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/dewavuwikagefifa.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/97198084668.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/fimuraginux.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/71759664207.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/fuzonugiso.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/nidaxojupeguzed.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/53265378857.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/sudepegalisusofoxovif.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21090815263318137769oa5ten78mr.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/rejedinefojisegomajan.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/79152782171.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/nibojuju.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/42095267537.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_off0000e750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 10420 bytes
SHA-256: 5c0c297a2dbd1c8d30fb2ab3b029664a3036c2c10be421eac4884ae7b54ad68a
font_02_sfnt_off000116d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D4 17620 bytes
SHA-256: b51afc37513deeb2006198b2f5d1944ac8acf249703ede21fb14aae397c8ec2c

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