Malicious PDF — malware analysis report

Static analysis result for SHA-256 7458c0439f51c570…

MALICIOUS

PDF

39.3 KB Created: 2020-06-12 20:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 410c3f848314fe6fd45f30a3ad724dd2 SHA-1: 2953e6387d3687de57b945eb3a719a088db30c45 SHA-256: 7458c0439f51c5707b2034747f676225d2c90b09b231f58f97add5ba30011146
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a page with Vietnamese text, suggesting a potential lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links indicates a likely attempt to redirect users to potentially malicious websites or for SEO spamming.

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://m.jekyllhydeapparel.com/uploads/1/3/1/4/131408103/131408103.html#aiphone+gh+1kd+h%25C6%25B0%25E1%25BB%259Bng+d%25E1%25BA%25ABn+s%25E1%25BB%25AD+d%25E1%25BB%25A5ng
    • http://coolingaround.com/uploads/1/3/0/5/130589452/4486982.pdf
    • http://horacesung.com/uploads/1/3/0/7/130738712/mutif_wemutipura.pdf
    • http://geiz5.bpmtc.com/uploads/1/3/0/2/130289745/xubexatofozivip.pdf
    • http://mta-sts.mx.ataempire.net/uploads/1/3/0/4/130488924/95b905c2c.pdf
    • http://blog.leafmarks.com/uploads/1/3/0/8/130814579/dojukefur-relasa.pdf
    • http://locsbyneek.com/uploads/1/3/0/2/130288644/kuzokuto-buloj-motolopos-vigunele.pdf
    • http://fmtmpodcast.com/uploads/1/3/0/3/130379293/405a90d9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nomutodiri.files.wordpress.com/2020/06/27292881347.pdf
    • https://kamugavages.files.wordpress.com/2020/06/98772930271.pdf
    • https://lareberu519560336.files.wordpress.com/2020/06/xizegabegotironibupa.pdf
    • https://woxujobeza.files.wordpress.com/2020/06/47571749358.pdf
    • https://wivutotob.files.wordpress.com/2020/06/mixodorasemefubeloz.pdf
    • https://boxisev.files.wordpress.com/2020/06/fiduk.pdf
    • https://zufiwupaned.files.wordpress.com/2020/06/xozaridudodusiw.pdf
    • https://vajozix.files.wordpress.com/2020/06/larijet.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb2.bin
ae2a3852f5c033161d8b3bf344b71dce60023d5815c494f46979baab36510cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB2 21764 bytes

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