Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedc3a4f191416eb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 14:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5a7f0b664dfa58d8e8a7e3b41c1cfa07 SHA-1: bddcaca254d1328723a23f188429706e96b2ed17 SHA-256: aedc3a4f191416eb8a7422a1121e03ee483cfb65f4063ff4524ad796adcb6f7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The PDF acts as a link farm, directing users to numerous external PDF files hosted on various domains, likely as a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://textingrights.com/userfiles/files/89213656009.pdf In PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/u6unn805k1iu83mirepbeah8gs/zisigel.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/54268467444.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/jupopewapajudowaxe.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/gexuwesatirasadinedila.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/49994659916.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/27048198520.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/1773380703.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/18581487939.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tunidisexubazamutexozaxo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109021806319712.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vidifomipigagawavojojif.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/38889828258.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bupev.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/8336647685.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/14421687105.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/75076429796.pdfIn PDF document text
    • https://rafautama.com/uploads/file/robebatonef.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fifosononusipumut.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/jukasefozufiwugumine.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-06/210906201754501587umyml7y4vcfn.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139e6200b200---46311361676.pdfIn PDF document text
    • https://netpage.info/userfiles/file/20992168186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=virtua+tennis+4+pc+download+windows+10PDF 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10916 bytes
SHA-256: 833ace0643ab34962c0f8ce4407744b61a774c26baf6fc26e0f576d294761dc0
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 16948 bytes
SHA-256: 7c12a4c07d59c773b056dfb6ff43ff9428f8317fef825db3daec44252a97bf98
font_02_sfnt_off000119b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1