Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4cf85768ae61c5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 13:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da976f6889c059b084031453ad586633 SHA-1: 675938b6254df68e7e21dc31bc48e79afdb376a1 SHA-256: 4a4cf85768ae61c50a6635b38d51468f44819525f60d7c68639ef063e52c5242
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine rankings or distribute malicious content. No scripts were extracted, but the sheer volume of links and the ML classification strongly suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://gpmpoolandspa.com/ckfinder/userfiles/files/wimisewopejuzazoragimeg.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/nokupuzejugegudowipi.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/15972932860.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/nupemad.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/monizeraluraliwuxugire.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/21940936453.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/palonederugidatosaboluli.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/sewewemajobagejor.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/53033203908.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/nixumivenaxagiwodokusiv.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/43220533458.pdfIn PDF document text
    • http://www.centralperdana.com/file/sofofopixalifekodelatijar.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/18503607462.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138295bbb8a0---vawovowik.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b6b8de2f6f5099bf9b9a4209f014ef2a/nojakalelavuja.pdfIn PDF document text
    • https://qkon.ca/images/file/88365367985.pdfIn PDF document text
    • https://33mobility.net/uploads/files/peneravuxirotigut.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/44531646881.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/81891912634.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/tuxewosejimozedaf.pdfIn PDF document text
    • https://eslms.com/userfiles/file/34871631809.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/27883508829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lava+all+android+mobile+price+in+bangladeshPDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 11024 bytes
SHA-256: dc11b7adc008359591581a039f2b1676b4a757a966a4926a818b83f2b6b4cd96
font_02_sfnt_off00010916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10916 18572 bytes
SHA-256: 203b9a5d1d96f2f9d016f949deb3b83987ee71ca6e93064079778d406ab13a1d

Open this report in the interactive analyzer, or submit your own file for analysis.