Malicious PDF — malware analysis report

Static analysis result for SHA-256 525c00b93635247f…

MALICIOUS

PDF

35.2 KB Created: 2020-06-02 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2208c6a3ec8a9ce2850e435aeaae4bb0 SHA-1: b5fbbebd7ef8809bca1e144cd909b08d555fc473 SHA-256: 525c00b93635247f8979c3368892a62c4ed5061f3c054bec9a9b4887d38458f2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristic findings. The primary attack pattern appears to be directing users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://stellarcocktails.net/uploads/1/3/0/8/130814411/130814411.html#lewis+structure+worksheet
    • http://farrellremodeling.net/uploads/1/3/0/5/130588430/6550812.pdf
    • http://lynnneuman.nyc/uploads/1/3/1/3/131384306/lamejokutibus.pdf
    • http://vanityfairs.co.uk/uploads/1/3/0/8/130813705/8377205.pdf
    • http://automyynti-jauhiainen.fi/uploads/1/3/1/6/131637239/jidevexidizonejomuga.pdf
    • http://overiceapparel.com/uploads/1/3/0/6/130603978/75fee6d837a6.pdf
    • http://sixfifteenhandmade.com/uploads/1/3/1/3/131381111/35fa4098859.pdf
    • http://theyachtracingpodcast.com/uploads/1/3/0/3/130323222/zosesibekunexen.pdf
    • http://kandykoated.net/uploads/1/3/0/5/130542863/93c57a5.pdf
    • http://mx.paintrollersplus.net/uploads/1/3/1/1/131164270/pexiwuriruzu_zetodatavolorij_zuzovox_gobinigu.pdf
    • http://stellarcocktails.net/uploads/1/3/0/8/130814411/terms.html
    • http://stellarcocktails.net/uploads/1/3/0/8/130814411/dmca.html
    • http://stellarcocktails.net/uploads/1/3/0/8/130814411/policy.html
    • https://suxeniruwip.files.wordpress.com/2020/05/kegobinax.pdf
    • https://xarofiraxun.files.wordpress.com/2020/06/letufukuzoneravowone.pdf
    • https://dameniv.files.wordpress.com/2020/05/49295786145.pdf
    • https://nojowijede.files.wordpress.com/2020/05/87641356339.pdf
    • https://vijujodivefi.files.wordpress.com/2020/05/29008195487.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc6.bin
c2e8bb3aae020f10ebee23c6922b9e678e22a11e607db5f28f0e79ccef9eeaa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC6 11120 bytes

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