Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aab8abfccdebd6a…

MALICIOUS

PDF

76.9 KB Created: 2021-10-06 06:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ebb6f80bb6f98f12b83e8b68370dbafd SHA-1: cc22dd15cc12ee0b2dc9856257a08f6eb2380176 SHA-256: 1aab8abfccdebd6a80a2c8227ddae7b6cc2f328d027af087fbaa7f74d9f0d329
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded URLs pointing to various domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. While no scripts were explicitly extracted, the ML classifier and the nature of the embedded URLs suggest a high likelihood of malicious intent, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=10+hours+of+praise+and+worship+songs PDF link annotation
    • https://esofagopisa.it/userfiles/file/pojogegedo.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/32781647740.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/zumezaba.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/xifimukujoge.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/9143d5021fe322be0bc5667b1476165d/44271043063.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/11368732055.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/356981845.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/tumaxal.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6ed3e4804---sajolunugomupujigiresa.pdfIn PDF document text
    • http://fedime.org/imagenes/tamin.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-17/20210917093329456130.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/28262117670.pdfIn PDF document text
    • https://arerp.kr/data/file///nibugisirigomirugex.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/203792610.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/gakaduvovizunaj.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kuwitijevanuz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/gijikumomekegozezowarim.pdfIn PDF document text
    • http://www.toptehnik.si/images/nasuxefebezokivujeruw.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/28441560605.pdfIn PDF document text
    • https://rotitelor.com/contents/files/93438496916.pdfIn PDF document text
    • https://linker.tw/files/73610511894.pdfIn PDF document text
    • https://upaspor.com/resimler/files/72026669604.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/54638963519.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/zuxinesubijogofepovo.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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 18648 bytes
SHA-256: 733d6b2529f123cd3b343cc5a48e8e6515948c5f1101296fca14c25d4b07e64d
font_02_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 10896 bytes
SHA-256: 228f431ee9a1a26e02919a6810b2b4bcc23703a1c0a92284eb85decc7fc30820

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