Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc4925e74950a14…

MALICIOUS

PDF

80.8 KB Created: 2021-09-24 03:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12068577c3104bdfc5005b30f29fd0c8 SHA-1: 65aadc1e38221505ea3963579bff652cbb2e073c SHA-256: 1dc4925e74950a144fc87f0054214961f57fdaa378a7eda3281112db4e234443
66 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains a high number of embedded links, many pointing to unknown or potentially disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to manipulate search engine results or distribute content through a link farm. While no scripts were extracted, the sheer volume of links and the ML detection point to a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://xlspandoek.nl/userfiles/file/34296055120.pdf In PDF document text
    • https://wupaojichangjia.com/d/files/44283291293.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/80624094453.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/7638741061.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/watokusinebariposukuloni.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/99694048739.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/dixibe.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/36379451453.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/76427785268.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/30999970260.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/rikewuvuwetelimofonora.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/23089048384.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/93785901296.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/petifiro.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/sefutipogusuxusizim.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/pajenajodekubaz.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/gijero.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/80065204264.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/cc8afc39f077aeefd6f371e615d8111f/93318861747.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/pifejis.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/nuvuzuzufuvelumuzovafef.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/1180905682.pdfIn PDF document text
    • http://isgsrl.it/images/file/78669895805.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/loxoxudagazoxitasumix.pdfIn PDF document text
    • https://termoformat.md/img/files/tuxabazixevo.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/6489237255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=brazil+vpn+pro+apkPDF 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 17328 bytes
SHA-256: 0f8692b2d279d84664c4e5705451703395f3659c70a7e84282efa689c38a690a
font_02_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10116 bytes
SHA-256: dc39e11f2e58a23ed77ef7660f49bf22897c6ad8b62d32b81dd02a52eb26cc5f