Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8176315ec39577a…

MALICIOUS

PDF

51.2 KB Created: 2020-03-22 06:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 132c57ce7e482968332d0e3ca528cd2f SHA-1: 2be4cdc935af76a58aa92dc29711f2f9f33e4dd4 SHA-256: b8176315ec39577ae25429f179b29b9580bfa73d1e726e017af95e6202e130b2
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body text mentions 'Como solucionar word producto sin licencia', which is a lure to encourage users to click on the embedded malicious URLs. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous unknown-reputation URLs reinforces this assessment.

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://hinterlandtreeservicesbyronbay.com/uploads/1/3/0/6/130605149/130605149.html#como+solucionar+word+producto+sin+licencia
    • http://wishlistsale.com/uploads/1/3/0/7/130739081/pitemiguv-vemamubup.pdf
    • http://classifiedsdc.net/uploads/1/3/0/5/130590108/ratesejopiderame.pdf
    • http://truebluewealth.com/uploads/1/3/0/7/130776180/374db84c.pdf
    • http://discountsatan.com/uploads/1/3/0/7/130739595/c83365983ba58.pdf
    • http://webmail.southaiken.org/uploads/1/3/0/7/130775209/98bc674f9b.pdf
    • http://garrisonlawgroupnc.com/uploads/1/3/0/4/130489128/6c1c24688.pdf
    • http://www.liberteequine.com/uploads/1/3/0/7/130738572/xepup.pdf
    • http://gohango.org/uploads/1/3/0/6/130639583/1d07ffb97.pdf
    • http://jpgrider.com/uploads/1/3/0/5/130541744/1177199.pdf
    • http://grassrootsarts.org/uploads/1/3/0/6/130604152/701555.pdf
    • http://www.beautifulbrains.net/uploads/1/3/0/2/130291471/1667534.pdf
    • http://mkwritingsolutions.co.uk/uploads/1/3/0/7/130739112/ritalazokejokalemok.pdf
    • http://mx.pushelitefitness.com/uploads/1/3/0/6/130640071/1630270.pdf
    • http://carrollcountydentistry.com/uploads/1/3/0/2/130272233/zukekuwugejuji-davuled.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009161.bin
5d1424b07ab1e71cab155cbbc144a41928809bcfc936118f0eadf3e26676a5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 8568 bytes
font_01_sfnt_off0000b07a.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 4144 bytes

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