Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baae664c20eddf0…

MALICIOUS

PDF

37.7 KB Created: 2020-06-02 03:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7237c4235b9a5ba5d72763c281f92516 SHA-1: 4345fcf536995312d5ed8946b0c85dad7d83cdf2 SHA-256: 6baae664c20eddf0c052e690cd6371d2d124d45a4f471abccfe684a9f09f89c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a heuristic firing indicating a large number of external links, suggesting a link farm or SEO spamming operation. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs point to various PDF files hosted on different domains, likely intended to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://favormovesu.com/uploads/1/3/0/8/130874308/130874308.html#houseki+no+kuni+rutile
    • http://ftp.aesiu.com/uploads/1/3/0/9/130969315/mefejewake-beribibaju-nibamuk-nazonules.pdf
    • http://deespassionateworld.com/uploads/1/3/0/6/130639607/batati_refesexep.pdf
    • http://interiorwraps.com/uploads/1/3/1/8/131871618/liwureb.pdf
    • http://tkpamanagement.com/uploads/1/3/0/7/130739393/6914609.pdf
    • http://webmail.zeldadoll.com/uploads/1/3/0/6/130639856/zuseme_jedav.pdf
    • http://cardiffandthevale.com/uploads/1/3/1/4/131406798/113674.pdf
    • http://favormovesu.com/uploads/1/3/0/8/130874308/terms.html
    • http://favormovesu.com/uploads/1/3/0/8/130874308/dmca.html
    • http://favormovesu.com/uploads/1/3/0/8/130874308/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://filovewevaj.files.wordpress.com/2020/06/mevirekafipizuwulixagow.pdf
    • https://tepafufamuvi.files.wordpress.com/2020/05/werusasira.pdf
    • https://kikibok.files.wordpress.com/2020/05/fizipuxudedikebewafa.pdf
    • https://misabidi.files.wordpress.com/2020/05/visekotipiberejukotiw.pdf
    • https://ronezas.files.wordpress.com/2020/05/59754879866.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d77.bin
144cfe91ddb34730c79f4efdadad200059e0276e977cb99b08c01cc74748867e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D77 3156 bytes
font_01_sfnt_off000068ba.bin
e832dc266cd15f62e237bbe71633410424e5e5bda64bf9528b2ef71a9709beba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BA 9996 bytes

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