Malicious PDF — malware analysis report

Static analysis result for SHA-256 b383bd51f8f38030…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 10:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0850728936bf6dacc9a893c1b9f8395e SHA-1: 49de62616f29077977475a1ae24502afe6c1a460 SHA-256: b383bd51f8f380309f50d23638ca67b08d60510d0b9f5417ddfc6d4f65fa7916
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dealershop.es/camarasegovia/userfiles/file/87874489202.pdf In PDF document text
    • https://suacuasathcm.com/uploads/files/jizewobokuwikexe.pdfIn PDF document text
    • https://cape-electronics.com/media/file/43011336541.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/lamozidusutagexo.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/11614386525.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210905_29140F54D20617D9.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/nedefujikemunedoxowo.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/52275931641.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/rapanojototutikozuwasajev.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d96be2517---lewizoxifejuzakukololon.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/bamemodivavapopuwuj.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/7584907103.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/vidujutisimuwu.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/42291176171.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/31686661992.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/18780900364.pdfIn PDF document text
    • https://emenu.hu/editor_up/48828287880.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/labaxaxidoduzizevagusu.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/60306502436.pdfIn PDF document text
    • http://dd-eng.com/files/files/matetunepeza.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/94639968787.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/bebodewoziwavamatikofene.pdfIn PDF document text
    • https://dintek.eu/uploads/file/zegeroniwedes.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/74300156788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=final+fantasy+tactics+onlinePDF 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_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 21832 bytes
SHA-256: 32bb4f46233d2b525e6a9f365e5759676ee6a52b202b956eca3c903bf35f3e8b
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 10320 bytes
SHA-256: 3ddaee535c4ed1dfdbbffe6085f54448976a6b2f02b9c4a09ad3f96a94243e15
font_02_sfnt_off00011e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1