Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d53f4a63d783aca…

MALICIOUS

PDF

38.6 KB Created: 2020-03-21 21:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7982f5ddd8b70dcfa6be54d268b37438 SHA-1: 97475187205e3e005c6cfa8548520ee663830129 SHA-256: 7d53f4a63d783aca5c26bb5f1b927fba0bfdabcd2e897f9b2620945098873eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links to other PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the PDF structure point towards a dropper or downloader, aiming to redirect users to potentially malicious content or facilitate further infection. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Dropper.Agent-8996377-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8996377-0
  • 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://olilaneclothing.com/uploads/1/3/0/3/130379126/130379126.html#movie+times+edwards+metro+pointe
    • http://wadethomasschool.com/uploads/1/3/0/5/130551249/fuporoxiresami-wejujufivaf.pdf
    • http://vartanpainting.com/uploads/1/3/0/8/130874655/baverusepeno_ranemuxib_fadagepadi_lufudarov.pdf
    • http://9f60dmh002.com/uploads/1/3/0/5/130551558/7111896.pdf
    • http://www.livelief.com/uploads/1/3/0/8/130814863/towoje_wobiluwuvar.pdf
    • http://huntingtonband.net/uploads/1/3/0/6/130603986/209e4a63dff0efc.pdf
    • http://jacksonlakeassociation.org/uploads/1/3/1/1/131163579/zafinon.pdf
    • http://marshfieldcomputerrepair.com/uploads/1/3/0/8/130814066/9811b4375f60.pdf
    • http://southfloridasurfing.com/uploads/1/3/0/2/130289201/nufurolezigurovixini.pdf
    • http://information4all.net/uploads/1/3/0/4/130435843/1e8558998.pdf
    • http://www.conciearth.com/uploads/1/3/1/0/131069863/e501d1f552b3e1.pdf
    • http://theflyingdachshundandmary.com/uploads/1/3/0/8/130813985/6483142.pdf
    • http://psichoterapeutaskaune.lt/uploads/1/3/0/5/130588216/972f0f0b64.pdf
    • http://costabluisland.com/uploads/1/3/0/7/130739443/rataxalini-jusejowure.pdf
    • http://haleyjoseph.com/uploads/1/3/0/3/130379174/vigupi.pdf
    • http://www.floridacaregivingservices.com/uploads/1/3/0/8/130815095/notug.pdf
    • http://lisamccafferty.com/uploads/1/3/0/7/130740456/6073592.pdf
    • http://greatneckgourmet.com/uploads/1/3/0/4/130476079/jikanewasew-zozanon-nibax.pdf
    • http://jdhhydraulics.net/uploads/1/3/0/5/130551402/7078495.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a6d.bin
73505de7eafbeab5b1687d0a4002bb364fdc2c54e2e22709724229c3c698da9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A6D 7444 bytes
font_01_sfnt_off000077b2.bin
67cd3670ae6e342190c318dfdfd494d386a674b289d6b9f0c2dec60068b7ac9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 16100 bytes

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