Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90a975b90a45879…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 03:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0dff1377ca539bd0a9dd39569e3793ce SHA-1: d800334c7f623ebec8d3ee01e8f179b48c585a41 SHA-256: b90a975b90a45879761c99affa3add2612ad260384927468701f9d38087df924
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many on disposable hosting, suggests a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=best+premium+android+apps PDF link annotation
    • http://123podkrovie.sk/editor_uploads/files/57643251577.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/35130467120.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-2/20210902134837836575.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/wubilelijidisadetu.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/rijojok.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/somima.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/kinukufodanonuzedopujej.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/tewobifukamuluvefito.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/98204545767.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/31592614089.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/fifawapute.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/27605238546.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/77928929522.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///tugebaside.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/gefazekazavanoma.pdfIn PDF document text
    • http://lejuriste.ru/files/file/tenifilo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386a02493cc---giboligatozodoxakaw.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/44368797253.pdfIn PDF document text
    • http://iucecb.com/files/file/32985724118.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/tofawaribuzosir.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/taradi.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/52579292197.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/24188361998.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_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10660 bytes
SHA-256: 2e5b616d8c9d3f9d684cd28bcbc4b3cd12400ddab5395830ff1f9696a8ec47b6
font_01_sfnt_off00010522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 17408 bytes
SHA-256: 8236c6e3568ea40b3392d7b7d4a91eb1d90ff2e91c9727c7da601ce7dff69906

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